Im 32, I ran in high school and then didn't run until 3 months ago. My ankles/feet have had nothing but problems. Just a minor pain the day after running. The Google told me it was tendonitis. If it got bad enough to where it actually bothered me, I'd take a day or two off and aqua jog. Finally I decided to go to the podiatrist. It turns out that I have extra bone on my first metatarsal on both feet. The extra bone fused itself to my second metatarsal on both feet. It sounds like surgery would be super minor and I'd be back running within a month, as soon as the pain was tolerable
For now, I bought stiffer running shoes and I was cast for orthotics.