Isn't it actually F'lhaminn or Minfilia's that tell you that it's difficult to tell that F'lhaminn is her adoptive mother because miqo'te stop physically aging in their twenties.
I'm pretty sure it's said by a npc at some point.

On another note regarding age, I remember there used to be a lalafell in the V1 at the miner guild that used to say something like "I've been sorting rocks for the last hundred years" or something along those lines, I always wondered if it was just some mistranslation of a lala really bored of its work or if the potatoes are actually going to outlive us all =p

There's a lot of thing you can learn by talking to random npc. Used to be another lalafell in the V1 telling you in the past they used to have Roegadyn throw Lalafell across broken bridges so they could tie ropes to repair them.