They have not saved nearly enough but it hasn't stopped them from retiring. The number to watch is the "old-age dependency ratio" which has risen to 25/200 from 21 per 100 in 2010. The trend is for this number to increase as more boomers surpass 65.
As people age their skills and acuity decrease, so while some may want to continue working its not at all a sure thing they'd be able to even if 2008 hadn't happened. I can't think of a good statistic to capture this and we're both looking at second derivative statistics.
https://www.wsj.com/articles/retiring-baby-boomers-leave-the...
