AppleScript: Move the oldest Item of a folder

Question

Hi,
i'm a newbie in AppleScript and trying to get my simple Script running, but it doesn't want.
The Script should look into "Folder_1" and should move only the OLDEST Item (File or Subfolder) in this Folder to another directory called "Folder_2"
But this is not running, some Ideas?
Code:
tell application "Finder"
  activate
  set sourceFolder to "System:Users:Administrator:Desktop:Folder_1"
  set destinationFolder to "System:Users:Administrator:Desktop:Folder_2"
  move oldest item 1 of folder sourceFolder to folder destinationFolder
end tell
Any Ideas?
It would be nice if someone can assist me in my first steps.

Answer 1

Better formatted:
set homePath to (path to home folder) as text
tell application "Finder"
     set sourceFolder to folder (homePath & "Desktop:Folder_1")
     set destinationFolder to folder (homePath & "Desktop:Folder_2")
     set creationDates to creation date of items of sourceFolder
     -- Which item is the oldest?
     set theOldestDate to item 1 of creationDates
     set j to 1
     repeat with i from 1 to count creationDates
           set thisDate to item i of creationDates
           if thisDate < theOldestDate then
                 set theOldestDate to thisDate
                 set j to i
           end if
     end repeat
     move item j of sourceFolder to destinationFolder
end tell