New to pipes, somewhat seasoned with cigars, here. With cigars, there is definitely a peak aging window based upon the blend, which in turn varies according to personal preference. Some cigars appear to get better forever if stored correctly (Fuente Opus, Cuban Ramon Allones Specially Selected), some are good for a specified window (Por Larrañaga PC peak from 5-15 yrs to my taste then fall off precipitously) and some cugars are best with minimal aging (Fuente Hemingway in Cameroon, Cuban Juan Lopez nos 1&2 and Saint Luis Rey Regios).
I can only imagine pipe tobacco blends being the same in that respect.