I count my blessings, hit 50 and no body issues whatsoever*, I'm just as active as I was as a teen. I know the warranty on my body parts are about to expire, so I stay lightly active every day, even joined a run club. But I won't do anything stupid like run a half-marathon. That's just asking for bad hips and joints, not gonna tempt fate there.
*except my eyes. Holy shiat I feel like I have the eyes of a 90 year old. One sees far away fine, but can't read anything closer than 2 feet to me. The other is blurry far away but can read things fine. But that eye also has what can only be described as giant translucent frosted flakes floating directly in my vision. Optometrist (girl looked 20) said they eventually settle from gravity, but nope lol