The best way to do it, I think, would be to forgo the hyphens completely and go with: I am a psychologist who works with children and adults. Anything else is awkward, ambiguous, or both. If it's necessary to emphasize that this individual works with children and adults (i.e., this isn't just introductory information), you could add in a 'both': I am a psychologist who works with both children ...
LARGE definition: of more than average size, quantity, degree, etc.; exceeding that which is common to a kind or class; big; great. See examples of large used in a sentence.
From Middle English large, from Old French large, from Latin larga, feminine of largus (“abundant, plentiful, copious, large, much”), of uncertain ultimate origin; see there for more. Along with big, it mostly displaced Middle English stoor and muchel (the latter surviving in much under a different meaning).
LARGE meaning: 1. big in size or amount: 2. enjoying yourself very much by dancing and drinking alcohol: 3. big…. Learn more.
Define large. large synonyms, large pronunciation, large translation, English dictionary definition of large. ) adj. larg er, larg est 1. Of greater than average size, extent, quantity, or amount; big.
large (lärj), adj., larg er, larg est, n., adv. adj. of more than average size, quantity, degree, etc.; exceeding that which is common to a kind or class; big; great: a large house; in large measure; to a large extent. on a great scale: a large producer of kitchen equipment. of great scope or range; extensive; broad. grand or pompous: a man given tolarge, bombastic talk. (of a map, model ...