Why does my guy friend joke I’m with a geriatric when my boyfriend (37m) is 5 years older than me (32f)? Is he jealous?

He made a joke about this 5 times today. I asked him if he was jealous and he said no. Im starting to think he might be or else why bring it up so much? Jokes don’t bother me any, just curious on why a man would say that, so I’m asking on here to see if I'm delusional or not. Haha

Why does my guy friend joke I’m with a geriatric when my boyfriend (37m) is 5 years older than me (32f)? Is he jealous?
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