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.
Today, one cow can produce the milk that it once took 10 cows to produce. Around 9.2 million cows are being milked on 110,000 farms in the United States. More than 99% of all dairy farms are family owned and operated. Cows are milked for an average of 3-4 years. A cow must have a calf in order to produce milk.Calves are fed milk until they are 8-9 weeks old.