I'm of 56 years and have a NBPEL (measuring from top of my fat pad?) of 5 1/2 x 5 1/4, it's always really good, solid and stays up for a long time, maybe due to me being physically fit by doing a mix of strength and endurance training, not being a smoker or drinker. Tried x4 some years back, but due to a poor flaccid size the strap mechanism didn't ever work. Use a Total Man vacuum for a time, seemed much better for me, but the system was clunky and I was moving around for work, so never got into it properly. Saw some good reviews on the Penimaster Pro, so I purchased and am waiting on it to turn up. Would love to hear from anyone with tips and advice.