I can only suggest you go and preach elsewhere.

I have no interest in someone's opinion who cannot understand that people of all (consenting) ages fall in love and have relationships. I'm not suggesting every age-gap relationship is the best in the world, but to immediately jump to the conclusion that every relationship of this type is predatory, abusive, and manipulative, it really shows your own character, more than it does the people in the relationship.

If it's a little gross to you, then that's fine, but to other people it's not an issue - they see the person, their personality, their humour, their passions, their individuality - they don't check their driver's licence for their age and then decide if it's appropriate to speak to the person.