n.
stage of life
1) to live to, reach an age
2) an advanced, (ripe) old, venerable age (she lived to a ripe old age)
3) an early, tender, young age (at an early age; at a very young age)
4) middle age
5) (a) college; high-school (AE); preschool; school age
6) (a) retirement, retiring (BE) age
7) a legal age; the age of consent
8) at an age (at a tender age; at the age of six)
9) of an age (people of all ages)
10) (misc.) to come of age ('to reach one's majority'); to look one's age ('to not have a youthful appearance')
era
period
11) to usher in an age (to usher in the computer age)
12) a golden; heroic age
13) the Dark; Middle ages (during the Middle ages)
14) the Bronze; Ice; Iron; nuclear; Stone age
15) in an age (in the nuclear age)
16) for ages
17) through the ages