Glad to see that this thread has lived on…and is providing so much useful info to many… 
I know that many on this thread are excellent planners and have everything figured out! 
The following post is really for the rest whose retirement plans aren’t yet well-funded.
One thing that many EMPLOYEES who hope to work “forever” (or at least until 65-70+) need to keep in mind is that employers are getting very aggressive about laying-off their senior employees to reduce their costs (older employees often have higher wages, expensive pension plans, more vacation weeks and other bennies).
I was on the phone with my cousin and learned that in the past few months, that she, her brother, and her brother’s wife have all been laid-off, even tho they had excellent records, and they had all been with their companies for 25-30+ years. They are ages: 57, 59, and 61. Two are engineers, one is a CPA. All had planned on working until 65-70. Lucky for them that they are under their companies’ “old retirement plan” which is quite generous.
My own husband retired 2 years ago at a time when his company was seriously-downsizing. Virtually everyone over 50 was told that their jobs would be ending within a few months, EXCEPT they kept ONE 57 year old and laid him off a year later. H chose to retire rather than transfer or look elsewhere. The timing was OK for him because he qualified for full retirement (old pension plan) due to age and years of service. That said, H retired at a time when we naturally thought that he’d be working for another 5 years, at least. H was 60.
My older brother retired earlier than he originally planned because he read the tea leaves and saw that his position was likely being eliminated. He still has 1 child to put thru college. 
So…since a number of companies have long-time high-salary employees still under their “old generous expensive retirement pensions,” companies are getting aggressive by trying to “move out” those employees.
It’s something to think about.
We often see posts from people saying that they’re not saving much for retirement (yet) because they plan on working “forever” or until they’re 65-75. The problem is…the decision isn’t always theirs to make. And, finding another job, with similar pay, is often next to impossible. And if losing their jobs means suddenly having no health insurance, less-coverage, or a pricier policy, that can also be a shocker.
Just something to think about if your “retirement plan” involves working past age 60.