Why do some people feel the need to lie about their age?

Why do some people feel the need to lie about their age?

I don't get it.

If you ask my mom, she's been 39 for the last seven years. This is somehow convincing at first because she does look younger (35-40) than her actual age (good genes I assume), but I find it ridiculous because of course people know I am 27 and my sister is 31, so the math doesn't add up.

She half-heartedly jokes we should claim we are younger too, but I tell her that honestly she should take it as a compliment when people mistake her as being younger and not lie about her age but be proud of it.

Why do some people feel the need to lie about their age?
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