Another problem with your assumptions is the life expectancy number you are using. Without checking, if I remember correctly for every year you work past age 60 your life expectancy decreases by 18 month. So if using an example if you retire at 60 and your normal life expectancy is 20 years. Retiring at 65 means that your average life expectancy is now 80 - (5*1.5) = 72.5. So instead of receiving benefits for 20 years you will receive them for 7.5. You need to rework your numbers with those factors in mind.

So bottom line, can the company expect us to reduce our life expectancy just because they want us to? Work longer you will die sooner. I don't think any study says otherwise.