Yeah, I understand what you're saying. I don't think parallel universes work that way anyway. From what I understand, for example, if you had a die and you rolled it you will end up with a 1, 2, 3, 4, 5, or 6. Whatever it lands on, let's say 3... or in my case 1. All of the other options that didn't happen split into different universes the second the result happened. We don't notice this splitting happening because we are in our own universe and we can't actively perceive this happening. This also happens anytime we are faced with a decision and choose accordingly.
To explain more clearly I'll quote from Scientific American, May 2003. "Imagine an ideal die whose randomness is purely quantum. When you roll it the die appears to land on a certain value at random. Quantum mechanics, however, predicts that it lands on all values at once. One way to reconcile these contradictory views is to conclude that the die lands on different values in different universes. In one sixth of the universes, it lands on 1; in one sixth, on 2, and so on. Trapped within one universe we can perceive only a fraction of the full quantum reality."
So, I don't think people can visit themselves in another universe because I just dont think it works that way. But, I like that point of yours about people getting old. Although, maybe when they get too old and die they have no "power" left anyway?