I have been raising 2 grandsons ( 12 and 14) for 11 years now- and my 2 youngest are 12 and 10. Having been together all that time, they are like brothers and sisters- and fight like it too, sometimes! I wouldn't have it any other way, though. It does keep you young, and gives a relationship w/ the grands that is hard to beat. Some of my other grands( I have 8) I only see 2-3 times a month, even though they live nearby. When the 2 12 yr olds were little, they thought they were twins. And people would ask when their b-days were, I'd say one on Dec, one in Jan- I got some funny looks!