My family has been pretty lucky so far with regards to retirement...
Grandad on Dad's side of the family: retired in 1974 at age 60, still alive today. Recently turned 92, and still pretty healthy. He can't hear so well, and while he seemed pretty well-preserved for awhile, he's starting to look more his age these days. Still, it's only been in the last couple years we talked him into not getting up on the roof to clean the gutters, touch up the chimney, etc. He seems pretty laid back and happy, and doesn't let anything bother him.
Grandmom: retired in 1975, died in 1994 (I forget how old she was)
Granddad on Mom's side of the family: retired in 1971 at age 55. Died in 1990 (lung cancer)
Grandmom: retired in 1980 at age 56, but worked part time/on-call sporadically through 1994, to keep busy. Still alive and kicking at age 83. Macular degeneration took her off the road back in 1999, but otherwise she still seems pretty healthy.
As for the event of one spouse often dying within a year of the other, I can think of once incident here at work that was somewhat publicized. There was a woman who passed away, from cancer IIRC. I don't know how old she was, I'd guess 50's or early 60's. Her husband just couldn't cope with losing her, and he shot himself within a year. I guess it must be really rough, living and loving only one person for most of your life, and then having that person taken away from you. It must really leave a hole in your life.
I do remember Grandmom having a nervous breakdown in 1995. I think too much happened in her life all at once. For most of her life, she had been around people. Granddad, kids, foster kids, grandkid (me) etc. In 1994, I was living with her, and so was my uncle. Well, Grandmom quit working completely in 1994, so she suddenly had a lot of free time. In late 1994 I bought my condo and moved out. Her dog died at the age of 13 about 2-3 months later. And my uncle works long hours, and would often come home around 7:00, eat dinner, read a book, and go to bed. So Grandmom became almost totally alone very quickly, and couldn't handle it.