I have a tip for those of us who are already parents:

Let your kids mess with coding right from the beginning, there is Scratch by MIT and Blockly by Google who are specially designed for kids and are designed in a way they will also enjoy it. 
Starting to code at an early age will help your kids develop a critical and logical way of thinking and it may advance them in life when they grow older, regardless of the whether they will be a programmers or not - programming can be useful in every day activity as well!
I helped my brother to start learning at the age of 13 and today he is working for money, enjoys hackathons etc. - I really believe programming helped him a lot and that's when he began not so early!

For the adults of us - I don't need to add another word, @cryptoctupus gave us all we need!