Sleep needs evolve based on individuals, but also based on their age:
At birth: 15 to 17 hours of sleep
Between 1 and 2 years: 11 to 14 hours of sleep
Between 3 and 5 years: 10 to 12 hours of sleep
From 10 years: around 10 hours of sleep
During adolescence: 9 to 10 hours of sleep
Adults: 7 to 9 hours of sleep