Who are the oldest and youngest precures? And how old are they?

Youngest is Ako Shirabe she is 10 years old!
Oldest is Tsukikage Yuri she is 17 years old!

i think cure bloem (heartcatch precure) is the eldest pretty cure.

ORDER FROM YOUNGEST TO OLDEST
Shirabe Ako / Cure muse = 10
Kujou Hikari / Cure Luminous = 13
Kasugano Urara / cure limonade = 13
Natsuki Rin / Cure rouge = 14
Hojo Hibiki / Cure melody = 14
Yamabuki Inori / Cure pine = 14
Momozono Love / Cure perzik = 14
Mishou Mai / Cure reiger, zilverreiger = 14
Yumehara Nozomi / Cure dream = 14
Kurumi Mimino / Cure milky rose = 14
Higashi Setsuna / Cure passion = 14
Misumi Nagisa / Cure black = 14
Minamino Kanade / Cure rhythm = 14
Kurumi Erika / Cure marine = 14
Hanasaki Tsubomi / Cure blossom = 14
Myoudouin Itsuki / Cure sunshine = 14
Aono Miki / Cure berry = 14
Yukishiro Honoka / Cure white = 14/15
Hyuuga Saki / cure bloom = 15
Akimoto Komachi / Cure mint = 16
Minazuki Karen / cure aqua = 16
Tsukikage Yuri / Cure moonlight = 17
Most of the precures are 14 years old.