19te would be rather close I guess. They were around before the 77y at least. Not sure what their comparison is towards the IVe.
We've been around for 4 yrs. 5 mo. EPI are probably the longest active NW regiment from the NA, being from late 2010 (so that would be 4 yrs. 11 mo. or thereabouts). However, I believe there
may be one or two older regiments. If that is not the case, then the EPI would be the the "reigning champs".