When did you really feel your body start to change and start getting aches and pains?

I’m 29 and I swear in the last year I feel like I’m starting to feel changes that almost make me feel old. My good friend said he literally felt things change the day he turned 30. I feel like eating bad food 100% drains me and makes me feel sluggish when up until the last year I could eat anything in sight and still feel great. I’m getting more stiff and feeling more achy after workouts and overall just feel older and not youthful anymore. My testosterone levels are fine and so are most of my blood markers but I just feel different in a lot of ways. When did you guys start feeling the changes in your body?