I'm in my late 40's and fought the filing monster all of my adult life. But a few years ago I bought the $30 kit from FreedomFiler, and it has made a world of difference.
Over the years I would make up a filing system, and diligently start using it. But somehow, self-invented filing systems seemed (for me) to have an interesting flaw: I didn't always file things consistently the same way. Because I had not written down the "rules", there were no hard-set ways of doing things, and I'd forget my old rules or make up new ones as I went along. This made it difficult to find things!
Freedom Filer has completely fixed that problem for me. The system is simple yet flexible. It encourages you to throw away the things you don't need anymore, and keep the things you do need. The pre-printed labels make your filing system neat, tidy, and easy to navigate.
FF even send a monthly reminder to tidy things up. No extra charge.
I made one addition to the FF system - I created a set of folders on my computer which exactly mirror the physical labels FF provides. That way I can use my optical scanner and digitize my stuff at need. And it comes in handy for filing the stuff that was "born digital" ... no more wasted paper! In fact, as time has gone by, I have scanned all but the most important papers I normally file (and shredded the originals). This makes things even easier to find, because they're all indexed in my computer. And yes, I keep good backups!
Maybe this can work for you. Good luck!