Getting enough sleep is an age-old foundation for good health. Now, a new analysis shows that long-standing recommended sleep ranges have stood the test of time.

Researchers from the National Sleep Foundation recently examined more than 3,200 sleep-related studies published since the organization released updated sleep recommendations in 2015.

The findings? “A decade of new science continues to support the original recommendations,” the researchers say.

NSF affirms the suggested nightly sleep ranges for nine age groups:

Newborns (ages 0-3 months): 14 to 17 hours daily
Infants (4-11 months): 12 to 15 hours
Toddlers (1-2 years): 11 to 14 hours
Preschoolers (3-5): 10 to 13 hours
School-age children (6-13): nine to 11 hours
Teens (14-17): eight to 10 hours
Young adults (18-25): seven to nine hours
Adults (26-64): seven to nine hours
Older adults (65 and older): seven to eight hours

“This review shows the core message remains unchanged: Getting the right amount of sleep is essential for health,” said Joseph Dzierzewski, lead study author and NSF senior vice president of research and scientific affairs.

The study was published in the journal Sleep Health.