The problem is on making it say 70 years is that a lot of the jobs those people are doing today will be gone in say 20 years time. What happens to those people if they are say 550 years old then?? Unlikely you'll get any for on unemployment benefit especially if you have a partner still working. Taking it to 67 is a good idea but make it 10 years time ..
PS . I'm 70 and still working 3 days a week..