Even though this might be a false generalization, I like this question for a number of reasons.
1) I don't think I've ever seen anyone ask this before.
2) I've wondered the same thing in the past, but never bothered to ask.
3) To this day, people don't believe me when I tell them how old I am.
4) I got carded regularly buying alcohol, until I was 35, even though the drinking age was 18 when I first started buying.
That should answer your question about me personally. Whether most Aspies do look younger than they are, I couldn't tell you. I haven't actually met enough of them face to face.
BTW: My avatar is not me. I'm fifty-one. Sorry, I will not post my pic though.
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I'm not likely to be around much longer. As before when I first signed up here years ago, I'm finding that after a long hiatus, and after only a few days back on here, I'm spending way too much time here again already. So I'm requesting my account be locked, banned or whatever. It's just time. Until then, well, I dunno...