Why are the throws lagging?

What are the three oldest world records in track and field?
Discus 1986. Hammer 1986. Shot 1990. Plus the javelin record has stood since 1996.

Did we have a Golden Age of Throwing in those days? German Jurgen Schult holds the Granddaddy of records in the discus, throwing for what was then East Germany. I have no notion why the throws were so good in that brief period of time (or perhaps not so good today).