I expect one easier level/light punching opponent in the near future, followed by a huge fight, a brief retirement, then repeat of the above. 4 more fights, 47-0. He won't want to share 46-0 with Calzaghe, or, maybe, he won't give a **** about that... I see 45-0 or 47-0 with the above pattern.
I'd say 3 more bouts. I don't think his ego will allow him to carry on passed the point of either him losing, or him being in very competitive bouts due to his age and not his opponents ability. I think he has fell out of love with the sport before, or lost motivation for it, I think that was definitely one of the gaps (retirements) in his career. So, yeah, as the above states, he won't be sticking around like a Jones Jr, or a Holyfield, etc.
why? he is a training machine, always in shape, just like hopkins. he is a technicl master, just like hopkins. I didn't said he would destroy everybody on his path up to being 45 years old. I said, he can last long and have easily 10-15 fights and fight until 45, would he lose, probably. but his technicl ability combined with his hard training would make him competetive even at that age. with right training and good food everything is possible.