at what age do you become 'old'?

[Storebought]

The body doesn't begin to decay until around age 35, so that makes a useful cutoff for "old". Of course, one should have visibly aged through years of adult cares and responsibilities long before then.

[Storebought]

The body doesn't begin to decay until around age 35, so that makes a useful cutoff for "old". Of course, one should have visibly aged through years of adult cares and responsibilities long before then.

Actually, studies show that the body begins to show signs of age around age 19 or 20.

That's most likely statistics concerning peak testosterone levels, sexual response, the first stages of hair loss, etc. With the exception of male pattern baldness, those things that can be hid through exercise.