The modeling I've done says that to maximize SS, I should take at 62, my wife should file and suspend at FRA and then take her full benefit at 70. During the file and suspend time period, my wife will take half of my benefit. I'm thinking it will depend on how our finances look each year I'm 62 and over. Interesting is that since my wife is five years older, she hits FRA the same year I hit 62.
As for this thread, I agree that many people who know they have health issues likely are driving up the percentage of people taking SS at 62. I have a friend that was waiting to take SS but got a diagnosis of Parkinson's and went ahead and filed early.
Another thing is pensions. I'm not sure how they all work, but my friends that early retired from the autos are required to take SS at 62. Basically, their pension is X and once SS kicks in, they still get X but it is made up of SS+a smaller amount from the auto.