Not [i]everybody[/i] is in their "prime" at 18 to 20 years old. I've seen plenty of people become much more healthy, attractive, happy, etc. later or much later in life than that.
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Well than they must make a huge improvement because the majority of people are most "in shape" from 17-21 making the "prime" of that 18-20. Between work and college, many people let themselves go.