For this reason, domestic sheep on normal pasture begin to slowly decline from four years on, and the life expectancy of a sheep is 10 to 12 years, though some sheep may live as long as 20 years.
Por esta razón, o declive das ovellas domésticas que pastan en prados adoita comezar a partir dos catro anos, cunha esperanza de vida media de entre dez e doce anos, aínda que algunhas poden chegar a vivir ata vinte.