(n.) Long duration of life; prolonged length of life\.

abidingness advanced age advanced years age age of retirement an incurable disease anility animal spirits animate existence animation antiquity being alive birth caducity constancy continuance debility decline of life declining years decrepitude defeat of time defiance of time diuturnity dotage durability durableness duration eld elderliness endurance existence feebleness green old age hale old age haleness hardiness having life heartiness hoary age immortality infirm old age infirmity infirmity of age lastingness life lifetime liveliness living long life long standing long-lastingness long-livedness lustiness maintenance old age oldness pensionable age perdurability perennation permanence perpetuity persistence ricketiness ripe old age robustness ruggedness second childhood senectitude senility senior citizenship spriteliness stability standing steadfastness strength superannuation survival survivance the downward slope the golden years vale of years viability vigor vigorousness vitality vivacity white hairs