FaceApp lets you see Houston celebrities like J.J. Watt, Kate Upton in their old age

People all over social media, including on Facebook, Twitter and Instagram are now posting their results.

So Chron.com put some of Houston’s famous faces through the aging wringer to see what they might look like in their golden years.

Above, you can click through to see what the “old” versions of some of Houston’s most famous celebrities, including Texans star J.J. Watt, supermodel Kate Upton and KRPC anchor Dominique Sachse.

You can find the now top-trending app in the iTunes App Store.

It won’t cost you anything, and you can use it for free for a maximum of three days.

However,  you should keep these security points in mind.

First, the app’s privacy policy says that it collects the pictures you upload to its service. That includes selfies you take.

Tech Crunch raised concerns about using the app, such as how it allows you to pick photos without giving photo access to the app.

Other reports say that it is possible that the app might try to upload other pictures from your photo library. To avoid this problem, do not give the app access to your photos when it asks the question during the course of use.

Here’s how to try it and the steps you need to follow:

• Open the app, then decline any subscription offers
• Click on the camera button in the center of the screen
• Snap a photo of yourself and click the ‘use’ on the bottom
• Once you see the filter options, click on ‘old’