Is Komatta Jiisan hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

TV · 2020 · 13 episodes · PG-13 - Teens 13 or older
Adult Cast, Comedy, Romance
A story about a handsome, but slightly troubled old man who pretends to be a fool to make the grandma's heart flutter. A tale of a couple celebrating their 50th wedding anniversary, still nurturing a new love. This is a story of a couple's daily life with nothing but happiness that you will want to watch forever. (Source: BS NTV, translated)
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