Get rid of “retirement” from your vocabulary. Great designers don’t retire. They die. They design to the death. I’m certainly not Fuller or the Eames, but I can certainly design until I die.

Charles Eames died at age 71 on a consulting trip to St. Louis.
Buckminster Fuller died at 88, and released two books the same year he died.
Mies Van Der Rohe retired actually in 1958 died in 1969
Victor Papanek ??
Frank Lloyd Wright died at 91 and designed 7 buildings in his last year, with 9 buildings completing construction after his death.
Eileen Gray lived til 98, built a studio at 80 to keep working
Walter Gropius died at 86 when his Tower East in Shaker Heights was constructed