Definition
An "oldtimer" (one word) is essentially the same as "old-timer." It describes someone who's been around for a long time, suggesting experience and familiarity. It often refers to someone who's knowledgeable in a particular field due to their extensive time involved. Unlike a novice, an oldtimer possesses a deep understanding built on years of practice. It's like calling someone a seasoned professional. This version is simply a stylistic variant of the hyphenated form.