LOL are u trying to say the senju clan have eternal youth ? its u who speculating but sounds like an fail imp who can't put up a good argument LOL
its show in the manga that tobirama is still very young when he become the 2nd hokage, and why is that ? because hashirama is already rotting in the ground,
and also tsunade is senju, but apparently she get old, not to mention even the sage is getting OLD LOL
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shortly after that battle can means 2-3 years, but its fact that tobirama is still very young when he become hokage