As an aside to the main point, that old saying that you can't teach
old dogs new tricks is not true for either humans or dogs. My dad
trained sheep dogs for many years, and they learned right up until
the day they died . . . if you're interested, I can explain the
confusion about that in reference to people in the research
about "learning" since the 70's.

Let me know, and I'll be happy to fill that in.