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Originally Posted by MysteryShadow
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There are similar types of stories, but the age change is usually less front and center or not as extreme. Arina Tanemura (who did stories that wwent to anime like Kamikaze Kaito Jeanne and Full Moon o Sagashite) has one where the protagonist goes from only 31 to 15.
http://www.mangahere.co/manga/31_ai_dream/
A good place to check is
https://www.mangaupdates.com/series....y=Old+to+Young It'll give you a few leads and the tags overlap, they have Old to Young, Age Transformation, Age Change, etc. so if you play with the tags and searches you can likely find more.
I've actually been working on translating Sumika Sumire, but I can't find good RAWS for them and I no longer live in L.A. so I can't get the manga myself.

I'm trying to do the Sumika Sumire on another site with so-so RAWS. This site has only chapters 8-13 and I'm about halfway through doing 13 (not published yet).
http://mangalator.ch/index.php?page=manga&manga=79633
There is also a light novel Ore no Kaachan ga 17 Sai ni Natta (俺のかーちゃんが17歳になった) where the protagonist's mother comes home looking like she was at 17. The premise is that the technique she used makes you young but halves your remaining life expectancy. Since it's a novel, I'm having a hard time working with it, but there are two volumes of it out so far.
Good luck- I myself like AR to young adult/second chance type stories and don't mind seeing others.