That's a somewhat naive assumption and sentiment. I've known plenty of devs around my age (40-50 yrs) who are really very bloody good at what they do and yes...shock horror...they do it for the money. Otherwise what or who will finish the paying the mortgage, help with paying for your children's further education, top up your pension, etc, etc.

Sure they may not have the "passion" but it also doesn't mean they're grinding away through their days. As I said in another comment, your priorities change and your perception/measure of job satisfaction changes as you get older. Mine certainly has despite being a techy and developer to my core.