Dude. She's like 15. We haven't seen her older sister yet.
OK. Areil was born in 1987, which makes her 23. http://dsc.discovery.com/tv/flying-wild-alaska/bios/ariel-tweto-bio.html She sure acts like she's a teenager.
Doesn't say how old Ayla is, but figure she's 1-2 years older.
http://dsc.discovery.com/tv/flying-wild-alaska/bios/ayla-tweto-bio.html