Combined from Sun / Day [日] + Old [老] to compose 者: represents "person".
trader, merchant
believer, adherent, devotee, Christian
skillful, in good health
reader
spouse, wife, husband
bad fellow, rascal, ruffian, scoundrel
author, authoress
writer, author
actor, actress
scholar
a patient
reporter
the latter
the former
author, writer
person
dentist
medical doctor