I'm 25 with arthritis knees ankles other than meds is there anything else I can do to ease or prevent?

Yes. If you are overweight, it will be less stressful to your joints if you get rid of some weight. To just reduce inflammation in your joints try omega 3, vitamin d3, and chrondtoitin sulfate supplementation. Check with your physician for doses that are correct for you.
Apos therapy. Can be looked in. If you pronate orthotics can help.