jane says on 20/Jul/10
in alex rider he was pretty short looks like he got a late spurt

MD says on 21/Mar/10
With a 5'10" Billy Bob Thornton:

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Alex has impeccable posture, but I don't think he is above 5'10". He looks like what a proper 5'10" would look like if everyone didn't slouch so much all of the time.

JoshJ says on 19/Mar/10
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next to nph (6ft) with similar shoes, he does look the listed height. somewhere between 5'10 and 5'11.