It's never too late to learn to daydream. Seriously, it is the most pleasurable activity that I engage in. I don't know how I'd get through life without it.

Just spend time imagining yourself in different situations. Any situation you want. You can go back and relive a pleasant experience that you've had. You can imagine that you have special powers and are on a very important mission. You can tell someone you don't like exactly what you think of them without consequence. Anything is possible.