I've started noticing a slight decline in my memory over the past couple of months. It’s nothing major. I still remember all the important things, but I’ve been forgetting small details, like the name of an actor I used to know or an old football coach. For example, I’ve watched How I Met Your Mother from start to finish before, but I couldn’t remember the real name of the actor who plays Barney, even though I knew it in the past. Is this just normal, common memory loss, or is it something I should get checked out?