Kid Gil and Saber Lily

Even if GilBer/GilArt/GilTuria/KinKen (Argh! let's just forget about the ship name! ) Gilgamesh x Arturia is defined as an "unhealthy relationship", I still love this ship. I think Archer Gil, normal Gil that we see in Zero and Stay Night, is the most problematic one among all the Gils... 

I saw some fan arts of Kid Gil and Saber Lily. They can get along quite well. (better than their grown-up selves, of course) I adjusted Lily's height a bit. So she wouldn't be that much taller and older than Kid Gil. I'm quite a bit confuse about Saber Lily's age. Her height is the same with a normal Saber. Is Saber Lily is around 14 years old? 

This series' girls' heights are ridiculous. I mean, how can 15 years old British girl is this short!? How can French woman like Jeanne is only 159!? Like, how!? And how can Lancer Arturia (full-grown version of Arturia) be 171 cm, since when she was 15 years old, she was only 154 cm?
Guess, "People get tall when they are grown"