Hi long time ago i read a manga about protagonist mother becoming younger, and son begin to have crush on her...
Can any one tell me the name of story...
Sorry for any typo and bad english i am typing from mobile

I'm sure I read it and I can't find it now. I'm guessing it was a oneshot and it was included in another series by the same author (which would explain why I can't find it).

https://www.mangaupdates.com/series.html?page=1&category=Age+Regression
age regression category I hope this helps

I don't think it's tagged with age regression. From what a noticed a lot of useful tags simply get deleted and later get recreated by the community (and then deleted again). This leads to a situation where older series lose all important tags.

Anyway I tried all kinds of fitting tags (like old to young, mother and son, age transformation) and found nothing. I think this was a shounen, ecchi oneshot. I think MC had a girlfriend (or a girl he liked) and the mother was interfering (and likely on purpose). In the end the mother got back to normal. As I said it was probably included in one of volumes of a series by the same author and makes it difficult to find.

I dont think it was oneshot it had maybe 5-6 chapters. Anyways i searched mother and son, age transformation, age regression and mother complex but was not able to find story i was looking for..
will try old to young now...

Quote from usuckme

I dont think it was oneshot it had maybe 5-6 chapters. Anyways i searched mother and son, age transformation, age regression and mother complex but was not able to find story i was looking for..
will try old to young now...

It might had more than one chapter, but I still think it was included in a longer series.