As someone in their mid-40s I can attest that random pains seemingly caused by nothing are part of the journey of life.
A few days ago I got out of bed and couldn't straighten my leg without insane knee pain. It lasted about a day and now it's absolutely fine. Yesterday I was vacuuming and my ankle just starts hurting like crazy. Fine in about 15 minutes. The other day I was bending over the sink washing dishes and my left shoulder blade gave me 7/10 pain. Seemed to be caused by an aggravated neck extensor but IDK.
Getting old sucks but I suppose it beats the alternative.