Welcome: This is a great forum.
I turned 51 a few days ago. In regards to trt, I am on it. I tested at 281, after 5 years of being natural. I used heavily during my competitive days, but was fine until about 47 or so, and even cialis would not work.
There are many other important variables besides total test. You doc is probably not trained to look for these variables. For example Steroid Hormone Binding Globulin will bind most of your free test, thus rendering the actual (free) test to a low level.
The bottom line is that if you have erectile issues, see another doc. There are three main variables related to erectile function. First, your test level must be adequate in order to get a hard on. For me, for 100% solid erectile function, I need a 1500 level of TT, which takes 300 mgs weekly of injectable test. My trt doc prescribes 200, and I fill in the blanks. Next, you need to be able to keep an erection, and PED5s' do that. However, there is one variable often overlooked: The mind. That can be hard to treat. To illustrate my sweet, loving, wonderful younger wife is a variable. When she was doing Cross Fit and/or training w/ me, I was ready to be "on the job" after just touching her tight body. A year ago, she decided to let herself go, and has gained a ton of weight and gotten really flabby. All the cialis and test in the world no longer works. I know I sound like a jerk, but it is important that people understand this third variable is very important, but often overlooked. That is why I advocate getting married later in life. At 51 I accept that she is going to do what she wants, and there is nothing I can do about that. I still love her and will never leave her, and that is good since we have a young son.
Having said that, there are now peptides that address the third, mental aspect of sexual desire.