Where I live, they measure height as well as weight, DS is currently about 98th centile for both and has been about that for ages. I hadn't noticed what this really meant until recently - he's 12 months, so playing standing up a lot more. Today he was standing next to a boy a couple of months older and he was a full head taller. He looked way way older, particularly as he also has loads of hair.
I was tall as a child and hated the way strangers expected me to act older than I was (and I had to stop going on kids rides really early too!) Is it inevitable that DS will have this too or might it even out as they move from baby to child? I'm slightly above average height now, but not particularly tall and nor is DH.