net.fredjean.cleandownloads.plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
  <key>Label</key>
  <string>net.fredjean.cleandownloads</string>
  <key>ProgramArguments</key>
  <array>
    <string>mv</string>
    <string>~/Downloads/*(mw+1) ~/.Trash</string>
  </array>
  <key>StartCalendarInterval</key>
  <dict>
    <key>Hour</key>
    <integer>1</integer>
  </dict>
</dict>
</plist>

Cleans out my download folder of any file not modified in a week...