Oldfags no longer exist. Oldfag specifically describes members of 4chan pre-/b/day. Any anon claiming to be a oldfag shall be automatically disregarded as a newfag, as only newfags care about the idea of "becoming" an oldfag or "cashing in" on being on the site longer.
The length the anon is on the site does not necessarily correlate with the quality of the poster. What matters is a matter of the post and the content posted as it stands. All newfag and reddit mannerisms, of which de-emphasize sincere content creation and incentivize comradery in static contemporary mannerism or the false perceptions thereof, are the antithesis of ideal original poster, and shall be chastised and driven off wherever found.
Content darwinism without name is all that keeps the site going, remember.