I've noticed how some people in Youtube watch a video featuring a teen "model", and then make stupid comments like "IS SHE LEGAL?????" and stuff.
For God's sake, if the video is from 2007, and she started making such videos in 2003 when she was 18, then it's simple mathematics:
2007-2003=4
18+4=22
So yes, SHE IS legal. Don't see child porn everywhere. Just relax and enjoy the video.