Our flower girl was 2.5 and the ringbearer was 20 months old. The kids had stage fright before the ceremony so they walked down their aisle with their mom (bridesmaid) and dad (groomsman). I'm really happy that their parents were in our wedding party...it made everything so much easier!
My BIL and soon to be SIL "asked" our LOs to be flower girls in their wedding next year! I'm pretty excited but kinda nervous about tears and stage fright!