Is it weird to you guys if someone likes you when they are 10 years older?

There's this guy who's 36 years old and I'm 26. He has the biggest crush on me and tries desperately to date me. I keep saying no everytime and he can't understand why I won't date him. He keeps asking me and it's getting really annoying. I keep telling him that we are only friends and he won't take the hint
Is it weird to you guys if someone likes you when they are 10 years older?
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