Originally Posted by Robbie

That is true if you are a younger man. That's why guys under 35 should never use test.

But every year after around age 30 you start losing your natural production and it escalates downward as you age.
I read once that a man who is 60 years old has less natural testosterone production than an 18 year old woman!

So at age 51 you are probably not producing enough testosterone to even register anymore.
You should definitely get on it and stay on it for the rest of your life. It will give you a huge increase in quality of life and how you feel everyday.