You mean stuff like Merupuri?
Let's see: - Rising Impact - not much in terms of romance until the ending
Spoiler (mouse over to view) The characters in question get married, after a bit of timeskip. - Dear Mine - Please Save My Earth - Soredemo Sekai wa Utsukushii - Kumiko & Shingo - largly untranslated - Otoyomegatari - while the characters don't fit your request 100%, it's a very good manga and definitelly worth a shot
- Bitou Lollipop - the age difference isn't that big
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