Board Thread:Theories and Speculation/@comment-27082825-20150210170257/@comment-1018594-20150210211053

Madara was older than 60 but not over 100 at his death; the Shinobi Organizational System was around 50-60 years old by Part II. If Madara was officially dead around 15 years to the start of the series, I'd peg him at 80-90.

Hashirama was old enough to see Tsunade as a toddler. Given her age of 53-54 by the Fourth Shinobi World War and using the same logic as Madara, I'd say he was around 35-45. Same for Tobirama.