THESAURUS
lifetime
age, animal spirits, animate existence, animation, being alive, birth, existence, for life, generation, having life, immortality, life, lifelong, liveliness, livelong, living, long life, longevity, period of existence, spriteliness, viability, vitality, vivacity
ROGET THESAURUS
lifetime
Period
N
period, age, era, second, minute, hour, day, week, month, quarter, year, decade, decenniumm lustrum, quinquennium,
lifetime, generation, epoch, ghurry, lunation, moon, century, millennium, annus magnus, horary, hourly, annual.