Growing old is no more than a bad habit which a busy man has no time to form.

Summary

This quote suggests that the process of growing old is not inevitable, but rather a result of idleness and lack of productivity. A busy person, who consistently engages in meaningful activities and pursuits, doesn't have the time to develop the "bad habit" of growing old. It implies that staying active and productive can delay or even prevent the effects of aging and emphasizes the importance of keeping one's mind and body stimulated and occupied.