"I feel older. Fifty-sevenish? But you know, hot for my age." She's lived a lot of hard, dense years and done more than you should reasonably be able to cram into twenty years.

She is a genius which is never more noticeable than when you're among non-genius kids your age in grade school. It led to her feeling more comfortable around adults as a child and then as things fell apart she had no real choice in the matter. She was the youngest X-Man for awhile. Even put in charge of training students barely younger than herself. It seemed like somewhere along the line everyone forgot she should have been a kid. In a different world she would have been at least a little longer.

It catches up with her sometimes. A childish outburst here and there. The jealousy over Rey.

"How old did you think?" Should she be offended? Then again, she won't be. She's comfortable with how she looks.