In England and Wales it is called Year 6 and the pupils are usually 10 to 11 years old. Often it is the seventh year of school; the years being called Reception, Year 1, Year 2, Year 3, Year 4, Year 5 and Year 6.
Quick Answer. According to Animals Australia, the natural lifespan of a dairy cow is approximately 20 years. The average lifespan of a beef cow is 15 to 20 months.
   However, actual gestation period of a cow can range from 270 days  to 295 days, depending primarily on breed[s], age, body condition  and nutritional health. Length of gestation is primarily an  inherited trait, but has nothing to do with the rate of maturity of  a certain breed or an individual animal.ince the Brahman is known to be the latest maturing breed of all cattle in North America, the typical gestation period for a Brahman cow would last from 290 to over 300 days â¦ in length.