Honda 2002 XR 80 or 2003 TTR 90 for 11yr old son's 1st bike?

I dont have kids, so I am far from an expert on this topic, but I started riding a Honda XL75 when I was 9 and grew out of it in about 2 years. My friend has a son that is about to turn 10 and he is looking at an XR80...I think he told me his son is 4'10". 11 is a tricky age...not really big enough for a 4 stroke 125, and will out grow an XR80 very quickly. You might try an XR100. I would imagine it depends on his height more than anything.

xr100r would be a better choice....about the same power but won't outgrow it as quick....my son rode one for 4 years(he's 16 now and riding my xr650!)