The time period of a human being's majority; the time during which a human being has reached physical maturity, and ending with its death.
The state or condition of a human being once it has reached physical maturity, and is presumed to have reached a state of psychological maturity, to wit: once it has become an adult.
The length of time for which an organism lives.
Some clams have lifespans far longer than those of human beings.
The length of time for which something exists or is current or valid.