I’m 62 and graduated 18 months ago. I still run 2 -3 times a week but have been plagued with really sore sacro iliac joints( back of the pelvis) every evening after a run. Is particularly bad in winter so I presumed it was arthritis. A few weeks ago I started taking high dose Vitamin D 1000 IU and some multivitamins. It has taken me a while to realise that my rise from my armchair to go into the kitchen to make a cup of tea or a G&T is no longer accompanied by grunts and groans as I clutch my lower back!!
I don’t know which tablet did it ( probably the Vit D) but what a difference! Worth a try if you have the same problem!