Old age; accumulated damage to macromolecules, cells, tissues and organs with the passage of time.
The state or process of ageing, especially in humans; old age.
Fruit senescence, leading to ripening of fruit.
Ceasing to divide by mitosis because of shortening of telomeres or excessive DNA damage.
Condition when the cell ceases to divide.
A young man; a male adolescent or young adult.
The quality or state of being young.
The part of life following childhood; the period of existence preceding maturity or age; the whole early part of life, from childhood, or, sometimes, from infancy, to adulthood.
A young person.
Young persons, collectively.