Planning for retirement is not just about finding the money. You will have time on your hands so is there something in your life that you love doing that you would do even if no one paid you? Figuring out what you love to do so much that you don't feel the need for money is a great way to tap into your true passion.
Think about it like this, when you get off work and are enjoying the weekend, what do you love ti do?The things you love are the things you're most passionate about. Even 15 minutes a day doing something you really love will make you happier and lead you to a more fulfilling life.
If you love music, talk to musicians and fans. If you love drawing or writing, talk to artists and writers. By talking to these people you'll find what you love most and find more ways to incorporate it into your life every day.
Having trouble then do some research. Research everything you can about your life's passion. This will not only help you become more educated about it, but it will also help you identify ways you can get out and enjoy it more.