I keep getting caught in the

"How old is your DS?"
"5 1/2"
"Oh, so he just started Kindergarten!"

web. Since DS is usually with me when this happens, I feel like I can't lie and I have to tell them he's in second grade.

DH says I should just answer "How old is your DS?" with "He just started 2nd grade." And let them assume what they want. I've never been good at clever verbal responses, so it's good for me to have a plan.