> Second, as some other have pointed out, what exactly is self control? What exactly do you do with that self control?

That is a simplistic criticism. The way you answer this question for yourself is to (1) look at the paper and how they define self-control (and cellular aging!), (2) follow the references that they cite for measuring self-control, (3) review the literature and critique it. Else, your suggestion is that people in the field of self-control haven't bothered asking your question, which is unlikely since they are specializing in the study of self-control!