After searching for information on the web regarding adults’ o legs treatment, these are the conclusions I came up with:

Usually a treatment is not required for adults with o legs. In severe cases a surgery is the solution.

Exercises can help make the legs look better (like it helps anyone else without this problem), but they won’t change the bow shape and they won’t “fix” the o legs.

There are o legs supporters/o legs bands that are claimed to help this situation, but I never checked these products and never seen any reviews on them (I’ll update this post with a link once I find where to get them.)

There are also High-Sandals for Bowlegs.

I recommend that you consult your doctor if you want to find the most reliable information and the best treatment for you.