Not sure if we can discussed about his situation, as far as we know he has a lot of money and businesses in the Philippines. So let's say that he really wanted to box and show that he still has it and give it back to his fans.
There is a recent video of him training with Teo Lopez. And it seems that Teo is enjoying his time with Manny as he has first hand knowledge on how the legend trains. And it was a win win for Manny as the young Teo might feed him energy. And that what Manny is, many young boxers look at him as their inspiration growing up and know they have the time to see him and what it takes to be a 8 division champ.
Yup, Manny has a lot of money, and I think he could not spend it all in his lifetime. The reason he returns to boxing is that he misses the spotlight. When he trains, the camera focuses on him. As you mentioned, Teo Lopez enjoys training with him, and it's not just Teo; many young boxers surround him, which gives him energy.
Two weeks more to go and we will see if Manny still has it to defeat a young boxer in Barrios. So far no movement in the betting odds, Barrios is still the heavy favorites to win this fight.