Are nudist beaches for everyone or just for adults?

I’m going on holiday with my boyfriend and there’s a nudist beach next to the family beach, I don’t really want tan lines so I want to go to the nude beach with my boyfriend but my parents say I can’t go there. I’m 16 so there shouldn’t be a problem, but is it fair they say I can’t? I thought it was for everyone that’s comfortable to be naked.
Are nudist beaches for everyone or just for adults?
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