Steve Young turned 35 in 1996 and played some of his best football two years later in 1998. He got a concussion in early 1999 that ended his career. Similar to Young, Romo spent years on the bench waiting for his opportunity.
Young had the concussions, for Romo it's maybe the back, and for Aikman it was both.
Either way, Romo should have a better OL for the next few years than either Young did in 1999 or Aikman did in 2000. Dallas also has a superior identity of run-first, smash mouth football that allows the QB to pick his moments without having to carry the team.
That combination bodes well for Romo.