The National Sleep Foundation recently updated the recommended number of hours for sleep by age and added a new category for adults 65+. More info can be found here, https://sleepfoundation.org/how-sleep-works/how-much-sleep-do-we-really-need
Newborns (0-3 months ): Sleep range narrowed to 14-17 hours each day (previously it was 12-18)
Infants (4-11 months): Sleep range widened two hours to 12-15 hours (previously it was 14-15)
Toddlers (1-2 years): Sleep range widened by one hour to 11-14 hours (previously it was 12-14)
Preschoolers (3-5): Sleep range widened by one hour to 10-13 hours (previously it was 11-13)
School age children (6-13): Sleep range widened by one hour to 9-11 hours (previously it was 10-11)
Teenagers (14-17): Sleep range widened by one hour to 8-10 hours (previously it was 8.5-9.5)
Younger adults (18-25): Sleep range is 7-9 hours (new age category)
Adults (26-64): Sleep range did not change and remains 7-9 hours
Older adults (65+): Sleep range is 7-8 hours (new age category)