According to some studies, 18-year-old males have a refractory period of about 15 minutes, while those in their 70s take about 20 hours, with the average for all men being approximately half an hour.
Research suggests that there is a noticeable gap between the time it takes young adult males to recover and that of elderly men, with the former taking around 15 minutes and the latter requiring approximately 20 hours, on average.