Now, you just knew I wouldn't be able to resist commenting on this one, didn't you?
Just because there is a saying doesn't make it true. A watched pot never boils?
Experience doesn't necessarily improve your skill level. If that was the case, why do you all want older drivers to stop driving, they have far more experience than you?
Or maybe older drivers' experience has taught them that driving slower is a lot safer?
It doesn't take very long for a confident driver to gain a basic control of their vehicle. However, all further experience does do is hardwire your bad habits (it does this so well you don't even notice), it doesn't teach you good ones. For that you need lessons and who thinks they need those once they have passed the basic, and very easy to pass first time, UK driving test.
Maybe the previous paragraph is rather simplistic. If you are interested in driving, experience will teach you a few survival skills: Leaving a bigger gap between you and the car in front, looking at the body language of drivers waiting to pull out, being aware of blind spots, etc.
However, if you are relying on the number of hours behind the wheel to teach you how to be a better and safer driver then you are deluding yourself.
Of course, this is coming from someone getting close to the age where he should stop driving so is no doubt rubbish, being spouted by a grumpy old git boarding on senility.