What's the youngest age an 11 year age gap can work?

i just turned 18 a few weeks ago and the guy i've been talking with is 29 next month. i've liked him for 3 years but never advanced anything because i didn't want to put him in a weird situation legally. i tried flirting with him a few months ago and he surprisingly flirted back. he recently asked me to dinner. is this okay? i really like him a lot
What's the youngest age an 11 year age gap can work?
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