Refer to the schools section as a general guide, but forget about the section relating to worksheets!!!

Be sure that the coach is comfortable and driven steadily.
All travelers should carry some form of identification and contact information in case of an emergency.
Frequent stops are important. Make each leg of the journey short and the breaks interesting.
Smart attractive name tags are quite acceptable - give these out as passengers arrive.
Seniors like to be informed about what is happening both inside and outside the coach - use the microphone.
Seat rotation on the coach is a great way for all members of the group to share the good (and not so good) sections of the coach tour leaders for senior's groups should be very aware of taking things a little slower, not introducing too many steps and that the memory is not what it used to be.