Things are very different than they were in 1946, when 19 year-olds routinely married. She will be a completely different woman in 11 years. Maybe she will still be interested in you, maybe she won't, but one thing is certain, she will not be anything remotely like she is now. That is just a biologic fact.

Personally, I'd shoot for someone at least maybe 30ish or so, if you seek someone "young." At least those women are legit adults and their brains are fully developed, unlike this girl's--and she is a girl still.

Good luck.