I think he means she under stated 'her' age as in ... she is older than she says.
Not under 'her' stated age, as in ... under the age she says.
But at first i thought it was under .. age too. I could be wrong.
Ok. I can see that. Looking back over OP's posts there are a few other turns of phrase which suggest English might not be not his first language, but only very minor ones.
I think most people will read it the way I did at first glance. And there are only two reasons I can think of why a WG would state an age on her profile that is older than she actually is:
- The profile has been swapped and originally belonged to someone else.
- The WG is lying because she's actually too young to be doing this work (which would also mean the profile was validated with fake/borrowed ID)