Ask HN: How do you deal with slight memory impairment?

I'm in my 20s, and have been noticing that I have a bad memory. I don't forget anything major or concerning, but its obvious my memory is below average. It is starting to cause a bit of a problem at work.

I started to write a lot of things down, but the problem is that I can't always anticipate what I to need to remember later on. So what tools/methods do you use to help you overcome this?