You Are Never Too Old to Learn vs. You Cannot Teach an Old Dog New Tricks
“You are never too old to learn.”
“You cannot teach an old dog new tricks.”
Why They Conflict
One holds the door open indefinitely. The other has already locked it and blamed the dog.
When the First May Be Useful
The learner is willing and the subject is new to them.
When the Second May Be Useful
The learner has declined, repeatedly, and the tricks in question involve software.
Official Ruling
Official ruling: Capacity persists; willingness is the variable. The dog, for the record, was never consulted.