I am a partner in a CPA firm with one other partner. We are both in our forties. We have been using many of the manager tools concepts (coaching, O3's, feedback model) with great sucess (thanks guys!). However, we find that with our younger team members, they see adjusting feedback as "yelling at them" (actual quote). Trust me, no yelling was going on, in fact, we both tend to slow down our voice and deepen our tone to soften the conversation (BTW I am off the charts high D). We have to provide feedback in order to improve our efficiency and effectiveness.
The other struggle appears to be a transition from working a jobs where a time clock was punched to working in a professional environment where flexibility is needed. Time is calculated at the second by these team members and any deviation from it is perceived that we are cheating them. Recently we had to commute to a client about 40 miles each way and the team member was highly upset that she was not getting paid for travel time.
Sadly, I have been joking about not hiring anyone under 30. However, our 21 year old receptionist volunteers to come in early when the work load gets a little crazy (much positive feedback) - so it isn't totally age- but I think a lot of it is.