People do change in time, this is a fact an no one can do anything about it unless you really stick to a strict life style. Considering that, you have two options:
- An expensive optionquick solution: Renew your passport, even if it is not expired. I am sure I have seen passport renewal forms with a checkbox saying "due to change in looks" or something like that. So just change your passport with a newer photo.
- A cheap long term option: Lose weight! so you will look the same as the photo in your passport 10 years ago!