I am around your age and a retired Licensed psychotherapist who is considering returning to practice part-time. So, Have been thinking of your question and were I you, I would see your patients with the precautions you have mentioned above. I don't think I'd wear gloves but definitely would avoid hugs, or handshakes with them. I would explain why so as not to hurt their feelings. I'd use hand sanitizer after each appointment and spray the room with a disinfectant like Lysol room spray. Also, I'd wipe down surfaces that have come in contact with your patients--couch, chairs, tabletops, and doorknobs. If the use your bathroom I'd wipe that down as well. I found maks through Amazon, but don't know if they are still available. We who are not ill are advised by the CDC to not wear masks. If you are still uncomfortable you could do phone appointments, or skype with your patients. However, I would still see them as your practice is small and you know your patients. You could advise them to be open with you about ANY illness they have and hopefully, they would be truthful with you. Also, sit a decent distance from each patient. You are doing a great job in working with those who are disabled. The good lord knows they have emotional issues as well. I was the mother of a child with disabilities who was greatly helped by a mental health professional through the years she was alive. Whatever you decide I"m wishing you the best.

My "advise" depends upon your financial situation. If your finances allow, I would suspend your practice until the threat passes; the threat of losing your clientele is real, but also is the threat of contracting the virus.
If continuing, as in the past, I suggest that you obtain a mask at any cost, and try to protect yourself.

Good luck,

John