The National Sleep foundation last recommendations advise to regularly sleep between 7 and 8 hours per night. Nevertheless, those recommendations don’t take into account inter-individual variability and are strongly age dependant.
Sleep indeed changes as we are getting older. Although it is not sure that the amount of sleep needed varies during adulthood, the way we sleep differs significatively. Older people hence often report experiencing poor sleep quality: it is shallower than before with regular awakenings during the night.
Yet, their sleep is usually more distributed and retirees tend to take more naps during the day.