Board Thread:Wiki Discussions/@comment-25358381-20140918020735/@comment-7292165-20140919010358

Well in his case a lot lol. But seriousl your physique has a signifant part to do with it cuz if your body isn't in shape you'd obviously slack in ability less than you would if you were in shape. Chakra reserves lessen once they hit past prime which would mean they couldn't sustain using ninjutsu as long or powerful.