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.
Selymes (1996) determined the minimal life span of beef cow lines as 8 years but, in his opinion, 10 years would be optimal. The average life span of purebred Hereford, crossbred beef cow and crossbred dairy cow populations was reported as 4.2 years by Arthur et al. (1993).or instance, cows born in April calved at an average age of 2.59 years, whereas those born in December did at an average age of 2.77 years. The difference is 0.18 years, i.e. 2.16 months. CONCLUSIONS The conclusions of our analysis generally support the results of earlier studies and practical observations.