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.
This keeps the cows producing large amounts of milk. The calf is either used to produce a new milk cow, or in the fate of almost all male calves is sold as veal meat. The average life expectancy of a milk cow is 15-20 years, so the cow is impregnated between 13 and 18 times. She will produce milk for as long as 6 years without having to breed her again as long as she is milked properly every day. While there are times that cows could be milked in private farms for extended periods of time, dairy cattle are typically bred in 10-14 month cycles in order to keep milk at a peak production rate.