I'm not over 50 (yet) but I saw this thread and thought I might be able to contribute with my experience. (I hope nobody minds.)

I was diagnosed with low-T about a year ago. I saw 3 different doctors (GP, Endocrinologist, and Urologist) and all 3 ordered to have my testosterone levels checked, as they couldn't believe that my levels were that low. (I was 41, and my level was between 175 - 190 on every test.)

In the choice of treatments, I opted for the intramuscular injections for 3 reasons:
1. Cost is considerably lower. (My insurance doesn't cover it, and $100 gets me a 3 month supply, including syringes)
2. I don't have to worry about transfer to my wife.
3. It's quick and easy, one shot every 10 days.

Someone mentioned earlier about the "ups and downs" of the injections. That's true ONLY in the beginning. After 6 months, my levels had evened out and I wasn't experiencing the highs and lows like I was at the beginning. I still can tell when I'm at the last day or 2 of my cycle, my energy drops just a bit... but 8 out of 10 days, I'm doing great, and the last 2 days I'm doing far better than I was before I started HRT.

The ONLY downside to the injections is (obviously) the needles. These are deep muscular injections of a pretty thick oil. And by deep, I use a 1.5" 22 gauge needle into my thigh. It was scary at first... now it's a peice of cake.

One last bit of advice for those on HRT... talk to your doc about zinc supplements. Zinc is a natural mineral that blocks the conversion of testosterone into estrogen.