Jeff, I spent about 6 months job-hunting in my mid-fifties and I was pleasantly surprised. My children were grown, this was a new phase in my life, and I was very enthusiastic about working again. The employers I talked to really appreciated that.
I agree with what Dee and others said about depression. Playing along with a therapist who says you are depressed, while you insist you are not, won't help you heal. How can you be sure you aren't depressed?