Are women turned off by guys who look older than they are?

I'm only 21 and I keep getting asked if I'm married or have kids and my 60 something mom was recently mistaken for my wife so apparently I look 40 years older than I am. I feel like I'd creep out any girls within 4 years of my age if I approached them and they thought I was in my 50s or 60s :( I stay fit and don't know what else to do.
Are women turned off by guys who look older than they are?
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