I don't think so. What's the point? You really have nothing to save for, so over-spending is no problem. Just battle a bunch of trainers and sell a bunch of unneeded and unwanted items. And taxes is definitely a no, since there's really no government at all; which is why Team Rocket, Team Magma, Team Aqua and Team Galactic are running around with only a small group of police officers, consisting of like one member (lololol), are running after them or making any effort whatsoever to stop them, and what proves that is that an eight-year-old kid can just go up to them and pwn them XD So no. If taxes suck in reality, then they'll suck even more in video games :3
And I believe Ash is 11 years old, though I forget exactly where I got that info from :3