Not only is there a large percentage of workers who are physically unable to work into their late 60's - there is also a large percentage of employers who are unwilling to continue to employ older workers.
A 60-some year old employee who makes twice what the equivalent college grad would require AND is a drain on the employer funded health plan is a prime candidate for the next round of "rightsizing."
Somewhere around 70% of all Social Security applicants today have not yet reached the full benefit retirement age.
I see many people who plan to work well into their retirement years. Unfortunately, it isn't all that easy for them to find a place to work at.
Ok, but don't assume that those 70% are tapping into SS because they CAN'T work, many chose to do it because they don't want to work AND, taking SS as soon as you can has it's benefits financially too. Yes, your overall monthly take is less but you have to figure out how much of a long term difference that will make. If you start drafting at 62 1/2 vs 67, that is 4 1/2 years of income you are taking in-what is the breakpoint for taking your payments at 62 1/2 vs 67 (or later). 99% of the people I talk to assume that it is better to wait and in probably 90% of THOSE cases it isn't.