It’s all genetics period. I’ve had arthritis since my early 30s. My kids have it in their 30s and 40s. Exercise definitely helps but getting up is a chore.. after a few hours movement is better. Part of life.
In my case, that is likely. Mine is relatively mild, but my cousin (again, Mom’s side of the family) got excused from P.E. in high school because she already had it.
I was starting to get it in my little finger. Told my wife it felt like someone stuck a needle into the joint. She said that’s arthritis. About that time I started the carnivore diet. That was five years ago. Pain hasn’t returned.
My oldest son, now 56, was initially diagnosed with Rheumatoid arthritis when he was in his early 40's. He has taken Plaquenil twice a day for several years now. Also takes an anti-inflammatory, and gives himself an injection of Humira once a week. When he changed Rheumatologists, the new doctor told him that he probably doesn't have Rheumatoid, but psoriatic arthritis, but they are treated with the same meds. He's fortunate in that he can move freely without pain, and works on a computer all day for his job, then uses his computer at night creating Fallout game mods for people to use in their games, plus he live-streams several nights a week.
I also have trouble getting out of bed and being able to stand up straight and walk. Once I'm up and around, I'm okay. It's just that initial part of getting up that sucks. I bought myself a new mattress thinking that might help, but it didn't.