In previous GW3, I've seen a guy in the states flying 44-years old MD80 in 2030. Leased since 1995. He just had 6 of them(plus s***loads of 737 & A320). So there is no(or no more, I don't know) this 35 years limit. I wonder why he did not switch them to 737(maybe pure lazyness in a finishing game), as they surely must have costed him a lot.
Plus he had no flight beyond 2500NM. I'd have gone full C919, in this position. It was dirt cheap in that game.