Board Thread:Naruto Discussions/@comment-46448870-20200726053501/@comment-32685487-20200726140438

She said vs Kabuto that she was no longer in her prime and she was about 51(she's Uzumaki/Senju so if even HER prime is before age 51 then that means it should be that way for everybody). So in the Naruto World a persons prime seems to usually be before age 51.