Emily Carter
Chickens go through three key development stages: chick, adolescent (pullet or cockerel), and hen (or rooster). There are several ways to estimate a chicken's age, but it is difficult to determine their exact age unless you have raised them or have information on their background. Estimating the age of a fully grown chicken is challenging, but there are some features that can help determine their age with reasonable accuracy.
| Characteristics | Values |
|---|---|
| Number of eggs laid | A chicken in its prime laying years will produce 5-6 eggs per week. As the chicken gets older, it will lay fewer eggs. |
| Size of eggs | Young chickens tend to lay extra small eggs. As the chicken matures, the egg size increases. |
| Vent colour | A moist, pink-looking vent indicates a younger bird. |
| Shank condition | Older chickens have larger, rougher shanks, whereas younger birds have smooth shanks with a sheen. |
| Plumage | A chick will be covered in a fine down coat for the first 6 days of its life. The first feathers will appear around day 7, and all feathers will be grown in by the fourth week of life. The second and final mini molt will start around the seventh week and last until the twelfth week. |
| Comb size | Young hens tend to have smaller combs than fully adult birds. |
| Spur length | The older a rooster gets, the longer its spurs will be. |
| Weight | Older chickens tend to get lighter. |
| Face | Older chickens develop wrinkles. |
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What You'll Learn
Observe the chicken's plumage and feathers
Chickens go through three key development stages during their lifetime. A chick is considered a chick until it sheds all its down, which usually takes around 12 weeks. During the first week of a chick's life, it will be covered in a fine down coat without any feathers. Around day 7, the first of the chick's feathers will start to appear, usually on the wing tips. By the fourth week of life, all the feathers will be grown in, and the chick will start to look like it has a bad haircut. The second and final mini molt will start around the seventh week and last until the twelfth week. During this time, the small baby feathers will be replaced by the first adult plumage. The boys will start to grow long pointed feathers on their necks, saddles, and tails. These are called hackle, saddle, and sickle feathers, respectively.
Once a chick has molted and lost its down, it enters the transitional period between chick-hood and adulthood, the chicken equivalent of teenage years. Hens over the age of 12 weeks are in this phase and are known as pullets. This period of their lives usually lasts until 20 weeks old, though it can be longer. The name ''pullet'' is generally used for any hen under one year. Pullets are considered adults when they lay their first eggs, which occur somewhere between 18 and 25 weeks.
After the first year, a chicken's plumage markings will intensify, especially with young roosters. Their hackle feathers will be pointed and will flow down to their shoulders. The saddle feathers will also flow down the sides. The body size of pullets will continue to grow and fill out their frames. At around 20 weeks old, most chickens will have achieved just over half of their adult body mass.
Somewhere between 12 and 18 months, a hen will experience her first full molt. This is when all her old and tatty feathers start to fall out and are replaced by new shiny feathers. These new feathers will help keep her warm through cold nights, keep her dry and insulated, and make her look more attractive to the rooster during mating season. By the end of their first year, chickens will have reached their full weight. Roosters will have developed into well-muscled and upright birds.
As chickens age, their legs will get rougher and scalier, and their combs, wattles, and feathers will become less vibrant. Older hens will have larger, rougher shanks, whereas younger birds will have smooth shanks with a bit of sheen to them. The combs and wattles of older chickens appear plumper than those of pullets. When the molt starts, the colour of the comb and wattle will have faded to a washed-out red or pink colour.
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Look out for physical characteristics such as spurs, combs, and wattles
Estimating a chicken's age can be a challenging task, especially for fully grown chickens. However, there are some physical characteristics that can help determine their age with reasonable accuracy. One of the most prominent features to look out for are spurs, combs, and wattles.
Spurs
Spurs are more commonly found in roosters, and they tend to increase in length as the rooster ages. A young cock will typically have short spurs, measuring just under 1 cm in length. By the time a rooster reaches two years of age, their spurs may reach lengths of 2.5 cm to 3 cm. While hens typically do not have spurs, older hens of certain breeds may also develop them. Therefore, the presence and length of spurs can provide a rough estimate of a chicken's age.
Combs and Wattles
Both roosters and hens have combs and wattles, but they tend to be larger and more vibrant in roosters. As a chicken ages, the colour of their combs and wattles gradually fades. During their prime egg-laying stage, usually in the first two years of life, their combs and wattles will be at their brightest. After this period, the colour will start to diminish. Therefore, birds with less vibrant combs and wattles are likely to be younger, while those with brighter colours may be in their prime adult years.
In addition to the colour, the size of the comb and wattles can also provide clues about a chicken's age. Young hens tend to have smaller combs and wattles compared to fully adult birds. As they mature, their combs and wattles will grow larger. Therefore, comparing the relative sizes of these features among a flock can help estimate their ages.
It is important to note that while these physical characteristics can provide estimates of a chicken's age, they may vary depending on breed and other factors. Additionally, as chickens age, the accuracy of these estimates may decrease, making it more challenging to determine their exact age.
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Assess the chicken's behaviour
Chickens go through three key development stages during their lifetime. A chick is considered a chick until it sheds all its down, which usually takes around 12 weeks. After this, the chicken enters a transitional period between chick-hood and adulthood, which lasts until the chicken is 20 weeks old. Once a chicken is a year old, it is considered an adult.
Observe the chicken's behaviour around other chickens
Young roosters may challenge the head rooster on a daily basis. They may chase the hens to mate and can cause nasty wounds. Secondary roosters in the flock will be subservient to the head rooster and will not be allowed to crow before him. The head rooster will also guard the hens against the lesser roosters.
Observe the chicken's behaviour around humans
Young chickens are calmer as they have adjusted to the hormonal changes in their bodies and found their place in the pecking order.
Observe the chicken's behaviour around other animals
If there are other animals around, you can observe how the chicken behaves towards them. Are they curious, fearful, or aggressive?
Observe the chicken's general behaviour
You can also observe the chicken's general behaviour, such as their activity level, feeding habits, and any unusual behaviours.
Compare the chicken's behaviour to that of other chickens of known ages
If you have multiple chickens of different ages, you can compare their behaviours to get a better idea of the age of the chicken in question.
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Check the chicken's shanks
It is challenging to determine a chicken's exact age, especially once it has reached adulthood. However, if you are keen to estimate a chicken's age, checking its shanks (lower legs) can provide valuable clues.
The appearance of a chicken's shanks changes as it grows older. Young chickens tend to have smooth shanks, while older birds develop larger and rougher shanks. The shanks of younger birds may also exhibit a subtle sheen. Therefore, examining the texture and size of a chicken's shanks can offer insights into its age.
It is worth noting that the rate of change in the appearance of shanks may vary among different breeds of chickens. Additionally, factors such as activity levels and maintenance can influence the condition of a chicken's shanks over time. Nevertheless, the condition of the shanks can be a helpful indicator when considered alongside other behavioural and physical cues.
For instance, the frequency and size of eggs laid by a hen can also suggest her age. Typically, younger hens lay smaller eggs, and as they mature, the size of the eggs increases. Moreover, the colour and moisture of a hen's vent can be indicative of her age. A moist, pink vent often signifies a younger bird.
In roosters, the length of their spurs can be a telling factor. Younger male chickens, known as cockerels, tend to have shorter spurs, usually under 1 cm in length. As they advance towards their second year of life, their spurs may reach lengths of 2.5 cm to 3 cm. However, it is important to remember that spurs can be trimmed or maintained, so their absence or shorter length does not necessarily indicate a younger bird.
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Count the number of eggs laid
Counting the number of eggs laid can be a good indicator of a chicken's age. However, it is worth noting that there are no definitive ways to determine a chicken's age, and counting eggs is just one of the methods to make an educated guess.
Young hens in the prime egg-laying stage of their lives, which is usually in their first two years, will lay an average of five to six eggs per week. As hens age, the number of eggs they lay decreases. A hen that is several years old may only lay one egg a week. However, this method of age estimation is relative to the usual egg count for the breed. For example, a Rhode Island Red that lays five to six eggs a week is probably 1-2 years old, whereas if she only lays one egg a week, she is likely several years old.
The size of the eggs can also be an indicator of the chicken's age. Young hens tend to lay extra small eggs, and as they mature, the size of the eggs increases.
The vent and shanks of a chicken can also provide clues about its age. A moist, pink-looking vent indicates a younger bird. Older birds have larger, rougher shanks, while younger birds have smoother shanks with a bit of sheen to them.
It is important to remember that chickens can go through moulting at different times for various reasons, and they may not always lay eggs reliably to their breed's average egg count, no matter their age. Therefore, using the number of eggs laid as an indicator of a chicken's age should be done in conjunction with other methods and observations.
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