Anecdotally, I have not found much correlation between age and management style. I have had bad managers of all ages!
I have had one good manager though, and it's pretty obvious what made them great. First is they listen to what problems you have and actually help you do your best work. Secondly, they protect you from the other bad leaders at the company. Thirdly, they work too hard.
Maybe that is a relative thing?
As in the norm is bad managers delegating everything to a fault, so a good manager by comparison works too hard?
Or maybe it is an availability thing?
My personal experience is
I'm much more motivated to work
If my manager is highly available from early morning to late evening.
