I think it is truly beautiful to imagine childe finding age very attractive. Like he doesn’t realize it but almost every man he’s had smth with has been either an old immortal being, or at the very least just men that are at least nearing their 40s. He’ll deny it saying it’s just coincidence — he just likes men that act mature and have a lot of good stories and are real wise… those just so happen to be common traits in older men… and greying hair and wrinkles around the eyes are a refined look. But then of course he’ll go hang out with Wriothesley and wrio will say something that emphasizes their age gap/sort of talk down to him and Childe will get flustered just by that. “When you get to be my age….” “Back when I was your age…”
God forbid Wriothesley stand up out of his chair and his back/knees crack and he grunts that shit sets Childe’s loins ablaze

Maybe one day he’ll acknowledge his ~tastes~ but that will require him to accept that the only thing stopping him from being a twink bred to be in gay porn is just the extra muscle mass he has. Even his height can’t save him he keeps somehow finding all the old men that are taller than him.