diagrammatic (adjective) explanatory: descriptive
Sinonime: ancient, doyen, doyenne, elder, elderly person, first-born, golden ager, golden-ager, grandfather, grandmother, head, matriarch, old folk, old-timer, patriarch, pensioner, retired person, senior citizen
Antonime: confusing,
mysterious,
obscure,
perplexing, puzzling,
vague