Tobi has a funny body, being able to reattach itself after getting severed by Sasuke. Either that or it was genjutsu. So there's a slight possibility Tobi ate an almost dead Uchiha's eye, but meh...
The only two scenes I recall about Madara was Kyuubi-Sasuke scene in 309 and the recent Tobi scene in 364. If he is the founder of the Uchihas (which I don't recall being said or confirmed anywhere), then yeah, he'd have to older then Sasuke's deceased aunt and uncle, making him 70+ by now.
I also don't recall when he was being referred to as a man =/
In the anime translation of the Kyuubi-Sasuke scene, Sasuke doesn't know Madara and says "And you expected me to know that person?" but in the manga translation I read he says "You know him? That guy?" Confusing... @
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Ah well, maybe something will be revealed in today's chapter. XD