Kingdom of Knuffel

You are around 18.

Hard to tell but you must be around 23

You've forgotten how long you've spent as a ghost, but it's been at least 500 years. Your physical age stopped at only about 23, though.

You've learned the secret of eternal youth so you'll always look 25.

You're something like 300

You're a brand new ghost, just around 15 years old!

You're probably something like 100 if not more

Reaching 1000 years, no more.

Around 32 seems correct.

You're still young, something like 14