Related:

• if (age(dog) = old) then num_tricks := MAXTRICKS
• You cannot teach an old dog new tricks.
• You can't teach an old dog new trick
• An old dog slowly being forced to learn new tricks.
• It is fatuous to attempt to indoctrinate a superannuated canine with innovative maneuvers.
  [ you can't teach an old dog new tricks. ]...
• Can you teach an old Sysop new tricks?
• Dammit, I'm no supervising technician. I'm a technical supervisor.
  It's too late to teach this old dog new tricks. -- Homer Simpson Homer's Odyssey...
• People keep telling me that I am never too old to learn, and I keep wondering why they say that you can't teach an old dog new tricks.
• Silly Magician, Tricks are for Hookers.