Originally Posted by Numinous
Except 20 years in Madara's case would be very noticeable, since he was 50~60 years old when Nagato was born and I think anyone can notice the difference between a 50~60 years-old man and a 70~80 years-old geezer. But, somehow, Rinnegan Madara and flashback Madara look the exact same, thus the plot hole.
Man stop reaching. He was old as shit wen nagato was born...and he was old as fuck when he met obito. Stop looking for these things and just enjoy the manga..