People have mistaken my son for my boyfriend, what can I do?

My son is 16 going on 17, he's a little lighter than me. I am thick 5'4" with a huge chest.. he's taller looks a tad bit older than 16, when at the mall shopping or going places.. people are always complimenting him on what a fine looking girlfriend he has... He has a job so sometimes he takes me to a nice dinner, the wait staff asks if it's a special occasion... a few guys have said... "I'd be hittin that every night, I hope you are."
People have mistaken my son for my boyfriend, what can I do?
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