At 33, I'd say my driving has changed somewhat since I was 16, or 25. I tend to be more defensive around other drivers - I find myself more likely to think that the next driver is going to do something stupid, so I tend to give myself more room around them. I found myself starting off as fast as I could from stoplights when I was younger, now that happens maybe a couple of times a month, as I've grown to realize that's extra strain on a car, wastes fuel, and you can still end up driving fast without necessarily accelerating as fast as possible.
I do still love to drive fast (but don't do so much anymore, at least not by the same degree, only 10-15 over now versus 20+ over as a minimum in BC, which I still do when we are out there visiting) , but I think that has changed not as a result of age, but two other factors - having kids in the vehicle, and moving to Edmonton from Vancouver, as photoradar is all over the place here, not to mention the occasional speeding ticket here can dramatically affect insurance rates (which wasn't as much so the case under ICBC).
And, like TPL, I also still curse at slowpokes driving Corollas at less than the speed limit and old farts toddling along in their Buicks.