Download the FaceApp app from the App Store or Google Play Store, and decline the offer to subscribe to the app when opening it.
Take a photo of yourself or choose a photo from your image library. Tapping the "Photos" button at the bottom will let you choose a photo from your camera roll without giving the app access to your entire photo library.
Scroll over to the "Age" filter at the bottom of the screen.
Choose "Old" and wait for the photo to process.
next slide will load in 15 secondsSkip AdSkip AdYou can also use demo photos provided by the app, or choose images of celebrities by tapping the button near the bottom of the app.
Celebrities have been taking part in the #AgeChallenge too, like actress Busy Philips.
And comedian Sarah Silverman.