Spelling Difficulties

Is this related to the "aging process" or what? Hohoho.. every time you deteriorate, you blame this "aging process". Maybe you just need to "refresh" your English lessons.

Recently, I often found difficulties in English writing. I often forget what's the spelling of the word. Is it "double l" or "single l"? Is it with "i" or "e"? I have to look up in the dictionary more often. And it becomes annoying.