Depending on the breed chickens naturally live from 5 to 11 years.
Like all other poultry, chickens do sexual reproduction. After mating and laying egg, 21 days last that the eggs become chicken. It should be mentioned that chicken can be reproduced without mating and rooster,but the eggs are not fertilized because they have no sperm.
Domestic chickens don't lay egg in the cold season and wheat has the impact in laying them.