The term 'not young' can be described by a variety of words, all of which have different meanings. AGED is a four-letter word that implies a person or thing has been around for a long time and is no longer in its prime. ANCIENT is a seven-letter word that suggests something is very old and has been around for centuries. ARCHAIC is also a seven-letter word that implies something is outdated and no longer used. ELDERLY is another seven-letter word that refers to someone who is advanced in age and no longer considered young. Outofdate is a nine-letter word that implies something is no longer current or fashionable.