Another reason is that old employees cannot adapt themselves to the rapid pace. Old employees find it difficult to learn new things rapidly. With their limited physical strength, they are not capable of heavy manual work. So old employees are not a patch on young employees, it means not only intellect but also physical strength.

　　Last but not the least reason is that old employees have already worked for more than half of their lifetime, so they should retire to enjoy life. The old employees have already paid out too much in order to look after their families and careers. So they should pursue their hobbies

　　In conclusion, old employees shouldn’t continue working for themselves. Moreover, advancement of society needs a new generation.

（实习编辑：袁梅）