Forty is the old age of youth; fifty the youth of old age.

Summary

This quote suggests that 40 is an age where youth begins to fade and maturity sets in, marking the transition from young adulthood to middle-age. Conversely, at 50 years old, one is seen as being in the early stages of old age, but with a sense of vitality and remaining youthfulness. The quote captures the notion that age is relative and can be perceived differently depending on one's perspective and societal expectations.