Does age affect your penis size? When I was in my early twenties, my ex wife would measure me. She like to brag that I had 8". My actual measurement was 7-3/4". Now I am in my late 50's and I measure 7-1/4". Granted my erections are not what they used to be but still relatively firm. I might add that in my 20's I weighed around 130 lbs. Now, I weigh around 180.Any comments?