Well, I can tell you about morning wood and age. I am 46 and almost every morning I have one (I cannot remember, but I think I got them back after starting Penis Enlargement some 17 months ago). Also, when I sometimes wake up at night to empty the bladder I have one. Another thing, sometimes during the day, and most often during the evenings in front of the TV, I get this tingling feeling in the johnson and he starts to swell some. No boner but he tries to. Quiet a pleasant feeling. For the record, I have gone from 8.25"x4.75" to 10"x6".