For what it's worth, I was thumbing through a popular Brazilian aviation magazine and they list a 737-200 flying for VASP (PP-SMA) as the oldest pax acft operating for the same carrier in Brazil.
I did a quick photo check here and it appears the acft went into service with VASP in 1969. Reading on, the text says the oldest pax acft in Brazil is a 1962 Fokker F-27 Friendship currently in service with Tavaj airlines flying as PT
-LAG. I tried a photo search on that model but came up empty-handed.
Let me take advantage of the discussion on old commercial acft by saying how much I miss the 707