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.
But dairy cows are also fed grain as part of their diets, yet they live to 5 or 6 years of age, some up to 14 if they're productive and making the producer money, living longer than your average beef steer.