Why do some people make your age a big deal for going back to college? Other words why do people care so much about age in general?

Paolaa988
This lady said I had my 4 years and I can’t get them back and it made me sad because I do wish I was 18 again sometimes and I’ll be 23 in the end of October this fall going back to college but I feel like it’s not too late if I feel dedicated and wanna learn. What’s wrong with that? Why do people make age a big deal in general?
Why do some people make your age a big deal for going back to college? Other words why do people care so much about age in general?
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