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.
Q: How many calves will a bison have in her lifetime? A: Female bison breed when they are two years old and have their first calves when they are three. Cows can live to be 25-30 years old having a calf each year under the right conditions.