Synonyms to of long duration

abiding, age-long, aged, ancient, antique, changeless, chronic, commorant, constant, continuing, continuous, diuturnal, durable, dwelling, enduring, evergreen, firm, fixed, frozen, hardy, immobile, immutable, in residence, indefatigable, intact, intransient, inveterate, inviolate, lasting, living, living in, lodging, long-lasting, long-lived, long-standing, long-term, longeval, longevous, macrobiotic, never-failing, of long standing, perdurable, perduring, perennial, permanent, perpetual, persistent, persisting, quiescent, remaining, resident, residentiary, residing, rigid, sempervirent, solid, stable, static, stationary, staying, steadfast, steady, sticking, sustained, torpid, tough, unaltered, unceasing, unchangeable, unchanged, unchanging, unchecked, undestroyed, undying, unfading, unfailing, unfaltering, unqualified, unquestioning, unremitting, unshifting, unvaried, unvarying, vital, wholehearted, advanced, advanced in life, advanced in years, age-old, along in years, antediluvian, developed, doddering, d