I've never lied about my son's age, but I HAVE explained his exceptional abilities (both mental and physical) before and had great success with that approach. I would never, ever condone lying about or in front of a child. I agree that if you're not asked, it's fine not to tell for something like this...but I definitely would not "fudge" a child's age in a situation where he/she would know about it. I agree that your child--ESPECIALLY because he is gifted--will learn that it is okay to lie, and you really don't want to set that precedent.