[member="Phislo Bress"]
Not too young, no, just too young for the up-front goal of wanting children and all the stuff that leads up to that. We have a strict Pg-13 rule, so while it's perfectly fine to, say, have you character have a boyfriend that's 17/18/19 etc, it'd be inappropriate to do .. fade-to-black kind of stuff with a 17 year old character (and against the rules).
And I just realized how that sounded...
But most people mentioning older ages are just looking for a more viable scenario. For example, I write [member="Xzav Ine"] as an adult in his mid/late twenties. He isn't the type of person to go have that kind of a relationship with a 17 year old, so mentioning that bumping the age a year or so would have made it a bit more of a comfortable age gap.
But you're more than free to write a teenager, up until about a year ago this character was in her teens (seventeen, actually) and has progressed in age since then via skipping through time, the 5 years that the current Omega Event is going to push the date (from 844 to 849), and so on.