Myelin for flexibility?

How not to get more stuck as we get older?

Learning works by a lot of repetition

Thinking patterns can be hard to and take time to acquire

But then also hard to call into question, adapt, get rid off?

Same for movements

You know if you've ever tried to change technique

I once thought I had made a major change to my serve

On video it looked pretty much the same as before :)

How can we train the brain 

to stay flexible in that regard?

To keep acquiring new things?

Make new connections?

How can we first and foremost learn to learn? 

To re-assess? 

Without driving ourselves crazy? 

Without spending too much time and energy on meta-thinking?

For the physical aspect I'd carefully vouch for 

Training for flexibility and variety to begin with (e.g. when young)

First learn or at least try the many different ways to hit and kick a ball

Try different sports

And of course

Use both sides of the body :)

And then

Pick and choose from that toolkit

Pro or con evolution?

How to view ambidexterity in the context of evolution? 

Are we meant to be "one-sided"?

Or is evo even neutral about it?

People live longer now => time and makes sense to develop both?

Before, maybe evolution had to prioritize developing 1 side only? Doing the learning somewhat quickly, then better switch to an application for survival?

I read about a study that found people's weak hand tends to get better as they age, and the other gets worse. 

Maybe that's hinting to 

1) having more time now and thus also unconscious use, repetitions, and cross-training, 

2) S-shaped learning curve including the at some point diminishing returns, and 

3) "use it or lose it" on the strong side, likely along with onsetting decay (yikes!)

?