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.
Most cows are productive until they are 12-15 years old. With proper nutrition and care, cows can have calves as old as 20 years of age! I know an 11 year old cow who is due to deliver this year. I would be surprised if cows are much different than horses.