When I first starting teaching and was younger than some of my students, I feel there were times I really had to work hard to prove to them that I deserved to be there. It made me a much better teacher and taught me a lot about age diversity in the classroom. We (both myself and the students) quickly learned to respect each other allowing me to provide the best education possible. With simple understanding and compassion of what each had to deal with in order to give and receive an education. Its a big step for an adult, old enough to be the parent of the teacher, to look at the teacher as a "role model" and can be very uncomfortable for the teacher as well. By showing them you have a complete understanding of the subject and treating them with respect I feel you will quickly come to a common ground and make a comfortable learning environment for the entire class.