Originally Posted by
chornedsnorkack
What if you could be reasonably suspected of just that - but are actually not?
As mentioned, since the average height of 17 year old girl is 157 cm, adults in their upper 140s should not be rare.
A vaguely teenage looking female in her upper 140s might be a 12 year old trying to look 18 and succeeding, or a 17 year old who is looking more like 27, or a 27 year old who is trying to look 17 and succeeding.
So, assuming that you have a bona fide 12 year old, or a bona fide 17 year old of 149 cm. The age can be proven from ID. Is a proven 17 year old claiming the child discount something that is likely to attract enforcement efforts, to try and prove she is 151 cm pretending to be 149 cm?
I don't understand what you are trying to do. Are you
a) trying to sneak in a too-tall adult with a kids ticket
b) trying to get a full compartment for two adults and two kids
If a) don't do it.
If b) see jiejie's answer. Nobody on the train will even think about checking the height of your kids.
What train are you planning to take (on Chinese New Year?) where you expect such big crowds that they will try to besiege your compartment?