 If you liked
Shikkakumon no Saikyou Kenja: Sekai Saikyou no Kenja ga Sarani Tsuyokunaru Tame ni Tensei Shimashita
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 ...then you might like
Zennin Ossan, Umarekawattara SSS-Rank Jinsei ga Kakutei shita
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Both stories are about a person reincarnating. The male MCs are basicaly the strongest in the world and they are just speed running their lives. Also none around questions why a kid had so much knowledge, power and conduct himself like an adult does.
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Recommended by iwsifakismag