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.
The natural lifespan of a cow is up to 20 years, yet few commercial dairy cows live beyond the age of seven years, and many younger animals go to slaughter. Selective breeding and, more recently, genetic manipulation, has resulted in the selection and production of cows who produce enormous amounts of milk.