Originally Posted by
Digifiend
Yeah, they goofed there. The last established ages for Frank and Val were 8 and 3. If five years have passed, they'd be 13 and 8. If you say maybe they'd had birthdays since their ages were last stated, that's 14 and 9. Instead, they went with them being 15 and 13. Five years would also make the already 19 year old Alex Power 24, but he still seems to only be around 21 (since his age gap to Julie doesn't seem to have changed). They should've had the FF scatter and reunite, that would explain the out of sync aging.