Show him you're not too young, in other words you're as mature as him or mature enough for him. Unless you are not yet of legal age, then he has a very legitimate reason.
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It's important to respect their opinion and take their feelings into consideration. It may be helpful to have an open and honest conversation about any concerns they may have about age differences and see if there is a way to address them. Ultimately, it's important to prioritize your own well-being and find someone who values and respects you for who you are.