WordNet sense 1 (used of the older of two persons of the same name especially used to distinguish a father from his son):

elder, sr.

WordNet sense 2 (older; higher in rank; longer in length of tenure or service):

senior

WordNet sense 3 (advanced in years; (`aged' is pronounced as two syllables)):

elderly, aged, aged

WordNet sense 4 ((used especially of persons) having lived for a relatively long time or attained a specific age):

old

WordNet sense 5 (having experience; having knowledge or skill from observation or participation):

experienced, experient