Life Expectancy: The average number of years individuals are expected to live based on current mortality rates. It provides an estimate for how long someone born today is likely to live.
Healthy Life Expectancy (HLE): This term refers to the number of years a person is expected to live in good health, without disability or major illnesses.
Longevity: The overall length of an individual's life. It focuses on the duration rather than the quality of life.