When I was about 12 years old my mother took me to see the family doctor. He said the condition should "go away" after a couple of years.
That was about 1949, it has not changed all that much. Doctors still tell that same thing. Believe it or not, they are right often enough and some boys do get lucky. The generally accepted belief here is that if the condition has not improved in two years it will not likely improve without surgery.
Hope is another matter, Guys hope for the best and consume vast quantities of various herbal remedies in the hope that they will work to reduce the size of their breasts. It does not work of course and the guys have wasted both their money and considerable time.
The question each of us must ask ourselves is: How much impact is this having on my life? Some of us find that we can ignore the condition with success and others are victims to severe emotional stress. If the condition troubles you, then you'll find a way to get the surgery.