Most corporations that gave pensions did not realize the employees were living so long, and were going broke paying them. They shifted to buying out pensions for lump sums, and not giving pensions to any new employees.
The flip side is most pensions did not keep up with inflations and cost of living. Its not unheard of for many retirees to have pensions of only a few hundred dollars a month which allowed them to survive in the early 1950,1960 etc.. but not now in 2021.