Not just physically, but mentally. Besides growing a beard, letting his hair grow, and not cleaning himself, his whole persona changed. His walk became somewhat sporadic, he would try and follow people around because I think he was lonely but never talked to them, just waited at the bus stop with them and smoked. And he would sometimes talk to himself. He was a totally different person months later.
It was an interesting transformation, I just wonder why he chose that life in the first place. He looked like he was in his late 20s, but by the end his face was all red (sunburned?), and he looked much older because of the beard and stuff.