Reason For Difficulty During Urination?

I am a 65 year old male in good health. For the last year or so I've had difficulty urinating while sitting during a BM and when I do finally go it is very slow and difficult to tell when the bladder is empty. However, I have no difficulty while standing. I was on Testosterone for a year (9-13 to 9-14) and my doctor found my PSA count normal as well as the prostate before I started the T, but I haven't had an exam or lab tests since quitting. I hope it's just a condition of "old age" and not a sign of a prostate problem as a result of using Axion Testosterone. My doctor prescibed it after I complained of "lack of energy" and found my free T level at 150. I felt fine but quit when I read about the dangers of using it and the price went from $25 a month after a year to over $300 per month. I've had no med ins. until now that I'm on Medicare. I feel great now that I'm eating a "healthy diet" and walk a lot.
Anyway, whats with the slow drain while sitting....no problem starting or stopping, just SLOW! THANKS!!