There are a few things you can do to change your age on the Monkey app. First, you can select the age range that interests you. This will give you a list of options, including birth years, for which apps will work with your current age. Next, you can choose whether or not to have a birthday celebration. This will add an extra day to your calendar and will show up in the app as a “Happy Birthday” message. Finally, if you want to change your date of birth, just select the year and month from the list of options and then press “change.”