Why?

My friend got an id but it was from a 16yro ... and he'll be stuck at 70 soon

Weird, thought it was just a time limit. Governement seems upset that the chinese youth flee the harsh reality and ruin their studies playing those games a bit more than before.

Tell your friend to check the account management section, there's some online forms where he can resubmit a new ID. Need a scan of it tho.

it's actually limited him to BC
I tried going to Borean and it said it requires the wotlk xpac

mmm? That's weird then. Maybe his client didn't install correctly. Tell him to check wow/WTF/config.wtf for the line SET accounttype "CT", if it's not CT tell him to change it.

Otherwise I'd try a fresh client install. Caus it looks more like a client problem than account problem.

in his battle.net it shows old version of wow

and says cannot verify his age; his id card belongs to an under16

我们无法验证您的身份证。请联系客服。

《魔兽世界®：燃烧的远征》
[WoW1]
中国(CN)

on mine;

身份证验证：大于18岁


《魔兽世界》
《魔兽世界®：大地的裂变》
[WoW1] (试玩账号)

中国(CN)

but on create trial account it shows cata, i might click to see what happens

Well seems it's the identity problem, he need to resubmit (a real one) via the customer services online forms.

Also it doesn't mention the age so maybe he just got a false ID number. If I were him I'd try to get an 18+ this time. Doesn't matter if the new ID doesn't match the previous one but he'll need a scan.

it wont work even if you re-submit the real ID ..coz hes under 18yro.
there is an anti-addicated system in the game to protect children from longtime playing ,which requested by china gov.
0-3 hours:same as normal
3-5 hours:cut half
>5 hours:gain nothing ,no exp ,no loot.

that means even your friend finally manages to go BC or WLK ,he still has to face this problem