Refers to a person who has been around for a long time in a group, workplace, or community, and is well-known to others. Often carries a nuance of being a veteran or established member.
He is an old-timer at this company and is trusted by everyone.
Several familiar faces attended the meeting.
Compound of 古 (ふる, 'old') and 顔 (がお, 'face'). The reading がお is a rendaku form of かお.