Thank you all for your kind responses to my question. I have not been too concerned with the low testosterone, partly because I assume it is part of the normal aging process. I will admit that the testicle shrinkage and gynecomastia seem to have had a more rapid onset than I might have expected, but I suppose that it is no different from menopause, which, for my wife at least, seemed to happen pretty quickly.
The problem with trying to treat it is that I am actually happier, more fulfilled, and more relaxed now than I have ever been. I don't really want to go back to the way I was. My wife is now the dominant partner in our relationship and we both really enjoy that. She has been teasing me about turning into a girl (mentally) for a year now and is having fun now that my physical expression (the boobs) are catching up with my state of mind. I have never been a real masculine guy, so this change doesn't bother me that much. And there is so much to like about these changes. My sense of smell, which had diminished over the years, is back full strength. I stopped on the way home at the grocery and for the first time in years, I could smell the coffee and green onions sitting in the bag in the back seat. I love being able to smell people again - their perfume or even their BO. I no longer feel anxious competing in traffic in the commute into work. I enjoy talking to people and helping them out. I'm no longer as focused on getting my work done, but I enjoy it a lot more now.
I understand why this could be distressing and I am a little anxious about how I will deal with it if my breasts become full sized. Now they are barely an A cup, but because I am so skinny and my nipples stand out, they are very obvious when I wear a t-shirt. I already have a body that, except for the breasts, looks like that of a woman, so I've considered just dressing as a woman. So I guess I do have some issues, but a couple of years ago I would have thought the idea of behaving or dressing like a woman was just whacked. I am a little confused about going through so many changes so quickly, but at the same time I feel good about the way I feel.
Again, I appreciate your responses. From your comments and from reading through other discussions on this website, I don't feel so alone. I know everyone will respond differently to having something like this happen to them. It's not what I would have chosen, but as long as it is happening, I want to embrace the changes and enjoy them as much as possible. I am lucky to have a wife who is supportive and kinky enough to get something out of this as well.
Thank you.