Age

Altar

(one of the stages of life)

Alter

(amount of time since the birth of a being or the beginning of a thing)

Alter

(state of being old; latter part of life)

Alter

(one of the stages of life)

Epoche

(particular period of time in history)

Generation

(generation — see also generation)

Lebenszeit

(lifespan)

Periode

(particular period of time in history)

Volljährigkeit

(time of life at which one attains full personal rights and capacities)

Zeit

(particular period of time in history)

Zeitalter

(great period in the history of the Earth)

Ära

(great period in the history of the Earth)

alt machen

(transitive: cause to grow old)

altern

(intransitive: become old)

but see altern lassen

(transitive: cause to grow old)

reifen

(intransitive: become old)

vergreisen

(intransitive: become old)