not 100% sure, on his feed card it had january down but there was also a an august 2011 date, but the feed records started in Jaunary and have been consistant. when i first got him out in the shop it looked tiny in my hand but yesterday i looked athought the same as you! his a skinny little worm though and quick!!! :-)
he maybe is a late hatchie from last year then! shame they didn't have better records. both me and 8 love my eeyore jimjams he makes a beeline for my sleeves every time :-)
lol had him out again today and he didn't look as big! am wondering if the pics are a bit deceptive, i would guess he's around 40cm ish. heres afew pics from tonight, the camera was quite close so again dosn't really help show his actual size :-)