Date with older man? What to wear?

So I met this man, he's more than 10 years older than me and we're having a date and Im clueless of what to wear, I dont wanna seem too young, which I normally do, any tips? By the way, I don't know where we might go yet since he hasn't confirmed the place, but I believe somewhere casual, thanks in advance!
Date with older man? What to wear?
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