I always think of Bear Bryant. Dropped dead of a heart attack a month after retiring.
Not many years ago, a 100 y/o man who worked for the LA transit department performing/supervising the cleaning of city buses retired. In his many decades with the department, he had taken only 1/2 day off...to attend his wife's funeral. He died within a month of retirement.
Two of my (male) neighbors who lived adjacent to my house died not long after retirement, one within a year. Neither would be considered elderly by today's standards, 60ish.
Something psychological & physiological way too often occurs when men lose what they consider their life's primary purpose. Scares the hell out of me.