No. Most I know never retired.
I think there are many shades of grey in the stages of 'retirement'. I know of several folks who have retired from an engineering or manufacturing career, and are now working part time at Lowes or the local hardware store. Not because they need the money, but because they enjoy some aspect of the job. And, because it generates a bit of 'mad money'.
I think there is a big distinction between working a post-retirement job because you enjoy it and working a post-retirement job because you need the money.