I woke up shortly after turning 31 and my shoulders hurt. Then they froze and I couldn't lift them. Then that sorted itself out over the course of six months or so, but now they're in pain every time I lie down any way other than flat on my back, and my hands occasionally go numb while lying in bed.

Of course, I've seen doctors and they just ¯⁠\⁠⁠(⁠ツ⁠)⁠⁠/⁠¯ "looks fine to us, you're still young lol"

I've been able to mitigate the other pain issues like my back and stuff with stretches and basic exercises. Seriously, fellow "no longer young adults", I cannot stress enough the importance of stretching and basic exercise, doesn't even have to be serious exercise, just take a brisk walk or play some VR while standing up, get your body moving, don't let it calcify.