I agree that it's about a guy remembering when he's young. I think the "like a rock" part in the last verse means that he's done with remembering what he was like and he's trying to be like he was when he was young.
I agree that it's about a guy remembering when he's young. I think the "like a rock" part in the last verse means that he's done with remembering what he was like and he's trying to be like he was when he was young.