Did you have a moment where you realized how much your body has aged?

Preface - I'm in my early 40s and live a sedentary lifestyle. Haven't really regularly exercised for quite a number of years, work from home, and gaining weight. The other day, I took my young kids to play basketball at the park. My mind is telling my body to run and chase after a loose ball. My legs had other plans. They just couldn't keep up anymore.

After we got home, I pulled my foot out of my shoe and strained my thigh muscle. Then I slept wrong and now I have a stiff neck on top of that. Sigh, I guess this is life unless I change my habits. Was there a moment in your life where you really felt that your body has aged?