It might be true that some ex footballers are suffering from effects of heading the ball.
However, banning heading would literally change the sport to a different discipline. Football would literally cease to exist as we know it if you can't put a cross in hoping the CB heads it in. This will never happen.
Also, today's footballers (including kids) play with much lighter balls, and are better trained in order to lower the impact - it is not 1980s/1990s hardcore sport that the kids encounter today.
Also, simply because some footballers are suffering from long terms affects of the sport (not all, and correlation can't be 100% conclusive) it does not mean heading should be banned. For instance, does anyone talk about banning rugby all together due to concussions that happen on frequent basis? In rugby, concussions result in about 25% of all injuries in which a player has to miss the game.
Frankly, if you want to lower the risk of pulled muscles, torn ACLs, broken legs, or concussions, maybe football is not the sport for you. It's just a part of the game, and if you desperately want to avoid EVER being in a car crash, well, don't get in the car. But we know that is a ridiculous proposition.