I agree with curiosity. To remain curious is really the key. Curious about life, yourself, your partner, your world, your future etc. I think this must come from within as we can't force or teach someone curiosity. Teachers can do this with kids, as you probably know for so many years. I find it a remarcable quality to be able to make people curious.
Understand neural plasticity and growth mindset - the brain is remarkable. YES. This is why saying that one is too old to change or learn is no longer believable
Never too old! Exactly!!
It's hard to teach curiousity, but we need to encourage it for sure!