Where should I place my daughter in my wedding?

I'm getting married next May and plan to have both of my children in my wedding. My son will be almost 5 at the time and my daughter will be 10. Should I have them be the the flower girl and ring bearer? I think my daughter is too young to be a bridesmaid, but thought maybe too old to be a flower girl. Any suggestions? Is there a role more special that I could have them be a part of??