In my 20's and 30's quite often. In my fifties, once a week maybe a bit less. Best experience: had to run to the local big discount store to pick up shampoo. It was late, so I just threw on jeans, shoes and a t shirt,, no socks, no underwear. I am not huge but still had to guide my manhood down my leg for the jeans were tight and ripped. There was a lady there, probably 10 years older. She followed me all over that store and it became a game, I am walking up a toy isle, she is walking towards me, food department, yup, bath essentials, sure enough, paint dept,that also. I swear she found me 15+ times. Near the end I was very turned on by the attention and it showed. She stopped looking at my face at all and just stared at my manhood. It made me feel great and I am sure her husband was happy when she went home.