okay so two stories come to mind
- https://www.mangago.me/read-manga/lucky_paradise/ this one doesn’t really have an age gap but the top is shorter and smaller than the bottom, albeit buff. He’s also super obsessed with him and the bottom is kinda nonchalant.
- https://comix.to/title/2vlmk-love-for-sale-dal-hyeon-ji this one has a shorter and older, more put together top. There’s a big age gap and I think the bottom is in uni.
I don’t think either exactly have the peace of god vibe but they’re what came to mind ^^

Anything like god of peace? https://www.mangago.me/read-manga/peace_of_god_mgs/
Or a lovely meal? Shorter younger top and older bottom where the top is kinda obsessed with the bottom