"life is short...make a mess of it!"
Congratulations! That's a great milestone - I thought you must be getting up there, as I have seen your name EVERYWHERE! Way to go.
Congrats John. I'm not sure which you are more proud of. 600 finds or the 18 wonderful hides. Keep on caching to 700 and beyond.
Why not live life like it is your last day....instead of pretending to be a member of the Peter Pan Club and believing you will be around forever.