I doubt the guy will come out unscathed. Even if he may be innocent in eyes of the law (if she consented), he isn’t in the eyes of public, particularly morality. I mean, if you see an old guy kissing a minor, even with consent, you—or anyone you know—wouldn’t look at them kindly, no? “But love is blind”, it’s easy to say that until it’s someone you know or love.
Age gap is one thing but engaging a minor is... only good for porn movies. Even in movies, it’s not looked kindly upon. Just look up: dirty grandpa (movie featuring Robert de Niro), Batman x batgirl, and tera x death stroke.