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.
Most sources agree that 15-20 years is average for dairy cows. I could find no information on life expectancy for herd sires for the beef industry (the lucky ones that don't end up as steaks and hamburger). Also, I could find no info on the bulls used as herd sires for the dairy industry, only the cows.creage is also an issue, one cow will need 2.1 acres to itself for it to graze for 143 days. Also water, an average cow will drink about 8 gallons of water a day but this will go up to 24 gallons a day in heat of around 90 degrees.