I have begun to make “old man noises” — anyone else do this?

So for the past year or so, I have been randomly and unconsciously making noise as I move—just soft grunts or gasps as I move around the house, carrying groceries, washing dishes, etc. My wife and kids think it’s hilarious, and they have a lot of fun at my expense about it. For context, I’m 52m. I am not in any pain, and I exercise regularly. I do a lot of training with heavy kettlebells. I regularly do long distance running. I don’t have any difficulties with movement. I don’t smoke. It’s just a thing I started doing without thinking about it. My Dad started doing this around my age, and he still does it. Maybe it’s a subconscious expression of mild surprise that, at my age, I haven’t fallen apart? Maybe it’s a sign of decrepitude? I guess I just make old man noises now. Does anyone else do this?