This lady told me she has noticed for the past months how she 's been constantly thinking about a specific word but when she's about to say it she says a word that sounds similar to what she was actually going to say, for example she said she wanted to say "facebook" but she said "spacebook". She talked to her doctor about it and he said that it was the "age" but she's concerned because it's been months and she wants to know if it could be related to some kind of illness or something like that.