[quote=@Gisk]
Does morphing take age into account?  I thought it just made you a fully mature version of whatever the DNA sample you took was.  
[/quote]

It takes age into account. In one instance Ax morphed Jake and went over to Cassie's house for dinner with her folks while they were all still in school. He morphed teen-Jake, not fully mature Jake. Cassie also morphed Rachel during the "burping DNA" incident and morphed Rachel at her current age.