Zacsmaster sounds like a typical male, all speed and no slowing down to admire the scenery... well anyway, this does happen but I wouldn't call it common, at least not at 50 (70 maybe). It does sound like he may be covering up for erectile dysfunction (can't get an erection, or can't keep it for long) - he'd need to see a doctor to get a formal diagnosis but if it's that then I expect he knows already; if it's something else then a doctor may help. If ED is the problem, then that's what Viagra and Cialis were invented for.