I'd pay to attend his lecture.
Bran, Marcus only aged once. He's been in play since then and has aged alongside the other teens. He was born on Christmas Eve, if I remember it right, and that means he just turned 18, unless Cer's elected to not age him.
The twins went from infant to six and haven't aged since. Rachelle was seven (going on eight) when we did the adventure at the theme park, wasn't she? She's now three years older than them... because I haven't played them nor bothered to age their matrix.