well in my view,
the reason why madara looked so young was because he died young ?
and an edo body have the same characteristics as the dieing body,
for example : edo nagato couldn't walk properly.
moreover,
if madara died young (reason is told above),
this contradicts the fact that madara lived too old to have met nagato or obito.
and tobi can't simply give nagato the rinnegan , why ? because obito is younger than nagato.
thats the plot hole.
If kishi explains something like you are saying, that madara lived too old , his body is just modified and stuff, i am fine with that too.
but until then, this will remain a plot-hole.
then everything that kishi haven't explain is plot hole to you right ?
in the 1st place i never actually comment about madara body state,
i was talking about obito knowing nagato and yahiko stuff, people said it was plot hole and i say its not and i already explained it above,
what you're questioning is different from the OP but still its somehow related,
as you said madara is supposed to be old when he died but is that true ?
nah none of us know that's mean you can simply said madara is old and there is now way that he know obito because he supposed to be die.........
but still its not necessary for madara to aging right ? i mean tobirama is supposed to be 50/60 but he looks like kakashi at that time:shrug:
this where the senju DNA take part if i do say so myselfU_U