“He’s in India, where there’s so much suffering around him that it’s just impossible to get angry at anything in life because he’s afraid, he doesn’t want to turn into the Hulk. During that time, he’s also beginning to think that integration is the answer: instead of running away from it, turning towards it. As you get older - and this is just where I’m coming from as a 43-year-old man - you start to know what your limitations are, but you are also aware of your capabilities. then you come to accept those things. And because you can accept those things, you’re actually able to use them in a much more efficient way. And so Joss and I sort of riffed on that idea: that this is the next, 43-year-old version of Bruce Banner - who’s more mature, who’s done plenty of suffering and soul-searching in this dilemma that he finally has to say, ‘OK, this is what it is, and how am I going to figure out a way to live my life with it?’ And so there’s this kind of iconic world-weariness and playfulness that we see in Bruce Banner.”
- Mark Ruffalo (The Art of Marvel’s The Avengers)