Buddha, Confucius, Father Time, Gandhi, Mentor, Methuselah, Old Paar, Plato, Socrates, Solomon, centenarian, dotard, elder, gaffer, geezer, golden-ager, gramps, grandfather, grandsire, graybeard, nonagenarian, octogenarian, old-timer, old chap, old codger, old dog, old duffer, old geezer, old gent, old gentleman, old man, old party, older, oldster, pantaloon, patriarch, presbyter, senior citizen, septuagenarian, sexagenarian, the quiet-voiced elders, venerable sir, veteran

Dutch uncle, Polonius, admonisher, adviser, backseat driver, buttinsky, confidant, consultant, counsel, counselor, expert, guide, instructor, kibitzer, meddler, mentor, monitor, orienter, preceptist, teacher