It's all a bit shit really.
I found this interesting:
"In 1908 when the State Pension was first introduced for those aged 70 and over, a woman of this age was expected to live on average an additional 9.3 years, and a man 8.4 years (1901), meaning pensions needed to last around 9 years. However, compare this to the latest figures (2011) and we see how pensions need to last longer. The current state pension age for men is 65 and for women it will reach 65 by November 2018. In 2011 men and women at this age were expected to live for approximately 20 more years" - National Statistics
Where I live it is currently 19 years post 65 for women, 17 years post 65 for men. (Overall life expectancy is a bit lower to account for those who die before the age of 65).
More interesting / depressing though is healthy life expectancy. Women in my area can only expect to get to 56 in "good health" men to 58. So people are spending the last 10 + years having to work in poor health, or having to claim benefits if they can't work. Which is going to have all sorts of economic impacts of its own.
I'm not advocating really for lowering the State Pension age again but I'm not really sure that just continuing to raise it saves the money we might think.
My DM who is WASPI age, retired at 57, could have gone at 55, local authority final salary scheme. Still does a bit part time because she enjoys it but equally if her health was worse would have been OK too. Obviously not all WASPI women are in the same fortunate position and I imagine some do feel genuinely shafted by the changes.
Equally, I've got NI credits for every year since I was 16, I'll have enough qualifying years for full state pension by the time I'm 51 (I've also got a fortune in student loan debt that I barely pay the interest on each year and am in the plan that doesn't get written off until you're 65 so will pay it my whole career - nurse so unlikely to earn enough to pay it off) so generalising about any age group and how much they work is probably not going to be accurate.