I find nontraditional adult learners to be more motivated to succeed and to accept challenges than traditional students. I also find that they will question rules and assignments less than the younger students. I find that nontraditional students do not give up as easily as traditional students. Younger students often have not been challenged to think critically. Such a challenge tends to be perceived as "being picked on." I have found that older students tend to work through their frustrations much better than younger students. A supportive, well-structured lesson plan and classroom is essential for all students' success.
I think one key to success in a diverse classroom is to have well-developed rules with a purpose.