Related:

• You can't teach an old dog new trick
• You cannot teach an old dog new tricks.
• It is fatuous to attempt to indoctrinate a superannuated canine with innovative maneuvers.
  [ you can't teach an old dog new tricks. ]...
• 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.
• 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...
• An old dog slowly being forced to learn new tricks.
• If (dog_age="old") then (num_tricks=max_tricks)
• You can lead a yak to water but you can't teach an old dog to make a silk purse out of a pig in a poke.
  -- Opu...
• This Sysop runs on Old No. 7.