I've seen both of them - she doesn't look like her pics, I can testify to that since they're doing that whole IG levels of filter and photoshopping. Nonetheless, if you saw Mia, you would not mistake it, and you'd be in for a very sensual experience.
As for HaYun she's early 30's and my only disappointment with her is her horrid over use of tongue with her attempts at "dfk", her overly exaggerated moans of "jagiya".
At the end of the day, for anyone who frequents Kamp's, and want to get an idea of age, the deeper the voice, and for us Korean's who know the "ahjumma voice", the older they are. Especially from those 40+ will sound like those older Korean servers at hole in the wall K restaurants