Honestly, a lot of video guy's fits are doable for younger people as long as you don't go overboard, and provided you slim it down. Assuming you already dress decently or have some sense of style or interest in fashion, then you shouldn't have much trouble identifying which pieces to avoid and which to incorporate into your fit. Keep it simple. Just take inspo from old guy style and then adapt it to your age and body type.
A lot of old men dress in relaxed or regular fit clothing, but you'll want to dress in slim fit (unless you're built, in which case reg fit can look good). Especially considering you're a manlet; you'll want to make yourself look as tall as possible otherwise you can accidentally get that I-raided-my-dad's-closet look.
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