Haha, I was thinking of The Expendables too, but not really as a model
On the one hand, Cad Bane might have undergone a drastic reversal as he grew older--along the lines of Eastwood in "Unforgiven". Perhaps he has a family now, or a community that he cares about. Maybe he spent so many years as a bounty hunter saving money in order to settle down and he feels like he's earned his time out of the spotlight.
I like the idea of making him something of a sympathetic character in his age, (almost like Ventress after she is betrayed by Dooku, she becomes more sympathetic in her quest for a new identity). He was such a vicious, powerful threat to the Jedi and everyone else in the Clone Wars, he might regret his earlier life now, especially if he has settled down in some way with a family.