How Long Should I Take Avodart For An Enlarged Prostate?

Yes, thank you. My question is about the length of time one should conitue taking Avodart(dutasteride) dfor an enlarged Prostate. I started taking it about ten years ago and my urination problem himproved within na few months. I am now 92 years of age my only problem now is waking up 3 or 4 times a night to urinate. Should I discontinue use? I have no doctor to ask this question as my Urologigist retired several years ago.