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Most 14-month-olds need 11–14 hours of total sleep per day, split between night sleep and one or two daytime naps.

Kids need different sleep by age, from about 12–16 hours in infancy down to 8–10 hours in the teen years.

Most 90-year-olds do best with about 7–8 hours of sleep a night, adjusted for health, daytime energy, and safety.

Most 90-year-olds do well with around 7 hours of sleep a night, with 6–8 hours often normal when energy and alertness stay steady.

Most 73-year-old women sleep best with 7–8 hours a night, then adjust that based on health, medicines, and daytime alertness.

An 80-year-old usually needs about 7 to 8 hours of sleep each night, shaped by health, medication, daily routine, and overall activity level.

Most 78-year-old men sleep 7–9 hours a night, with many feeling best around 7 to 8 hours plus short daytime rests.

Most 76-year-old women do well with 7 to 8 hours of nightly sleep, with regular schedule and quality mattering as much as total time.

Most 75-year-old women feel and function best with 7 to 8 hours of sleep each night, adjusted for health, medicines, and daily energy.

Most 72-year-old women sleep best with 7 to 8 hours a night, with 7 to 9 hours still healthy if she feels rested.