Here's why:
* "Escape from Scorpion Island" is a fictional show: There's no real-life Jeremy Hartley, and the characters and their ages are entirely created for the show.
* No official information exists: Without official production notes or character bios, there's no way to know the fictional Jeremy Hartley's age.
If you're curious about the ages of the actors portraying characters in the show, you can try searching for information on their profiles on websites like IMDb.