He worked 60 years for the same outfit - far longer than most employees anywhere; and in investing “time is money”. In addition to the compounding effects of earnings, he had contributions piling up for sixty years. Yea, the basic benefit calc itself is likely generous, but all those years - 60 - compounded just how generous it was.
In order to crimp some of the tier 1 pensioners from being as “blessed by the system” as this guy was, they’re going to have put in a mandatory retirement rule set not by age alone, but by age OR 25/30 years in the pension system already. Call it an “out by 30” rule. And set it for whichever comes sooner - age 65 or 30 years in the system.