I've kept a journal kinda on-and-off for the past twenty years. I rediscovered a bunch of entries (on Hypercard, if you can believe that) a few years back and reintegrated them into my current format. There was a lot of stuff that I had almost forgotten about.
It is harder to be regular about keeping the journal these days, being married, having kids and a job. But I manage to put some thought down every now and again.