Congrats on this next chapter in your life!
I'd recommend setting up a profile so that previous coworkers and friends can connect with you and be apprised of your latest professional aspirations. Absolutely use a photo so that these aforementioned people can recognize you. As far as future employers go, they'll eventually discover your age -- so upfront transparency is best.
In your case, start small with filling out the "experience" section of your profile. Instead, add your education, skills, any professional or volunteer associations you may still have. And concentrate on documenting the accomplishments of your Ph.D. studies. If you present an abstract or paper at a conference, upload samples of it. The idea is that future employers will be wowed enough with your current work that they'll pay less mind to the years on disability.
Best of luck!