Hens can typically mate as soon as they start laying eggs, which is usually around 4-6 months of age. However, some breeds may mature earlier or later.
It's important to note that while hens can mate at a young age, they may not be fully mature and their eggs may not be as fertile. It's generally recommended to wait until a hen is at least a year old before breeding her for optimal fertility and egg production.
Roosters also reach sexual maturity around the same age as hens, typically around 4-6 months.