I used to be sharp as a tack, had a memory like an elephant.
Now, literally -two minutes ago- I had a thought "I should really go and do -this- before I forget to." And then I got distracted for JUST A MINUTE making tea; I was watching some parrots argue in a nearby tree.
And now for the life of me I can not remember that thing I thought I should do.
And this was only two minutes ago(!)
Even ye olde "Don't think about it and it will come to you" trick isn't working.