The only oji-san age gap romance I know and liked was Ristorante Paradiso and its "prequel" (published after the main story): Gente. I personally like the artwork, but if it's a little too rough for your liking, I suggest watching the anime.
Spoiler (mouse over to view) I think that the first two subtitled episodes are available on http://www.youtube.com/show/ristoranteparadiso
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