[ Rex's expression flattens out. It's not serious - it's hard to take that sort of thing seriously after this long - but he lets out a disgruntled grumble of a sigh anyway. ]

All this time, and everyone's still so surprised that I might pack on a pound or two. I'm still in good shape for an old man, I'll have you know.

[ His lip twitches, betraying he may not be entirely serious. ]

You'll be the same when you're my age, I bet. [ Or... equivalent of. ] It's fine. We've got money. I'll buy some new ones.