KasiCair
Are you fking stupid? Creation Rebirth doesn't cost anything when activate, it's a sub-skill of 'Strength of a Hundred Seal' it will only use the chakra stored in the seal nothing more no side effects or cost of life span. If there really side effects or cost when activate then Sakura would have become old woman already, because she doesn't have bloodline of Uzumaki and Senju.