Is it normal to be this forgetful

I don't exactly know how to properly explain this but I am going to try my best. I can be doing something normal, or something I do everyday like routine then all of a sudden I complety forget what I'm doing or how to do it. example; one time I was putting on my mascara and all of a sudden, I completely forgot how to do it. I had the tube in one hand and the wand in the other, and I just stared at it. I know, it's SUCH a rediculously basic task but I couldn't figure out how I was supposed to do it, and I've been putting on makeup for years. I have many other examples if needed, but I thought I'd give a basic one.