How many hours of sleep are considered healthy for humans?

The amount of sleep recommended decreases with age. Here are the suggested hours of sleep recommended:

Ages 3-5 should get 11-13 hours of sleep.

Ages 5-12 should get 9-11 hours.

Ages 13-18 should get 8-9 hours.

Age 19 and older should get 6-7 hours.

Basicaly, the younger you are the more sleep you need.