what am i nervous about?

terry is out of town and before he left the boys planned to eat dinner "out" at mcdonald's one night. our sweet neighbor down the street gave each of the boys mcdonald's gift cards for Christmas that they have been quite anxious to use. this is a super lesson in value. . .before we left they got out the coupons that came in sunday's paper and made a plan as to who was going to use what coupon so that they could get the most for their money! I was impressed--they ended up with 2 big macs, 1 hamburger, 1 small fry and 1 large fry for $5.50--not bad.
AND, yes you read that last sentence correctly. 2 big macs. l and g both downed a big mac with no problem. this wasn't the first time. grandpa introduced the big mac last month. what am i nervous about? the fact that they are only 7 and 9. . . what are 14 and 16 going to look like?