69 Moby Thesaurus words for "long standing":
   abiding, acknowledged, admitted, age-long, aged, ancient, antique,
   chronic, constant, continuing, conventional, customary, diuturnal,
   durable, enduring, established, evergreen, fixed, folk, hallowed,
   handed down, hardy, heroic, hoary, immemorial, immutable,
   intransient, inveterate, lasting, legendary, long-established,
   long-lasting, long-lived, long-term, longeval, longevous,
   macrobiotic, mythological, of long duration, of long standing,
   of the folk, oral, perdurable, perduring, perennial, permanent,
   perpetual, persistent, persisting, prescriptive, received,
   recognized, remaining, rooted, sempervirent, stable, staying,
   steadfast, time-honored, tough, traditional, tried and true,
   true-blue, understood, unfading, unwritten, venerable, vital,
   worshipful