There was something in Family Tree Magazine on this subject some time ago. People sent in instances of very young ages of witnesses - I can't remember the youngest, but I think there were children. I think the basic conclusion was that there does not seem to be any rule about this.
Sorry I can't be more specific - if I can remember the issue of FTM I'll get back to you!
I know my cousin was anxious that I would be 18 when I was her bridesmaid as she wanted me and the best man to be witnesses, but I don't think there was a specific age. You just had to understand what you were witnessing (which was the vows).
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