Welcome to the forum Toni!
Your 16 yr old scooter has a lot of miles on it!
To be clear....
Your issue is that it idles way too high after it is started?
Starts OK, just that the engine races.
Do you have any history with it?
Ran OK, for previous owner, or no?
Or had been sitting unused for a period of time??
We've got some pretty clever 'carb' guys here - they should be along soon to help you.
Stig