There’s an oft used expression “You can’t teach an old dog new tricks.”

For many years the expression held water. However, over the not inconsiderable span of my life I have noticed that Humans can be conditioned to learn new and better habits and conduct, ergo, new tricks. 

2 examples that jump out to me are not smoking indoors and picking up pet poop (PPP). 

I'm sure there are many others too.  

Bottom line, there is hope (and new tricks awaiting) for Humanity!