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.
In 1997, dairy cows were kept on average for about 3.3 lactations, giving an average lifespan of about 5Â½ years for a cow entering a herd as a heifer at 2 years of age. The report believes that this lifespan is relatively short in terms of the potential lifespan of cows, which can live to 12 years or older.