I'm also like you. I keep up with developments and make sure I'm always on top of my game. But arguably that needs to be done outside of work. As you're getting older and have family and other responsibilities, you don't want to go back home and work more on learning the new stuff. You just want to chill out and do other things. That being said, if you don't, given the pace things are moving in technology, you're soon going to be obsolete. And this goes back to the age-old question of what to do with the segment of the population whose skills are out-of-date or who whose jobs can be replaced by technology. This is going to be one of humanity's biggest challenges.
Until a better idea comes a long, like it or not, the only solution I see right now is a form of socialism. i.e. those with skills and talent have to pay a part of their salary to keep the others afloat. Because I'm not sure I would like to live in a society that uses people for a few years in their prime and then discards them like rotten fruit.