i never realized this was another "Kenneth is immortal" joke

S6E19 "Live From Studio 6H"

I think I had assumed it was just Jack McBrayer portraying a random 1970's page, just like how Hamm/Baldwin are portraying random 1970's anchors here. But now, I am pretty sure that is supposed to be the same Kenneth we know and love, who has not aged a day since.