With DS4.5 I used to think that he's perfectly normal and our friends' kids who are the same age are just a little bit slow. Then it hit me that they can't all be that slow

. My son will also be probably the youngest in K this fall. I guess in our case the nature worked in our favor and "skipped" a year for him by being born couple weeks early, shortly before the deadline! He hasn't been tested yet and I don't believe he's PG though, but still full of surprises every day. Sounds like you'll have a lot of fun with him!