What's My Age? is a free lifestyle app developed by Zimm Studios for Android users. As the name suggests, this app helps you quickly check your age down to the second by setting your birthday upon first use. It's a handy tool for those who sometimes forget their age and need to check it on the go.

The app is simple to use and has a clean interface. Once you set your birthdate, the app calculates your age and displays it in years, months, days, hours, minutes, and seconds. It's a useful feature for those who want to know their exact age to the second.

However, the app requires internet access for advertising purposes, which may be a downside for some users. But the developer assures that your birthday is kept private and will never be transmitted over the internet. Overall, What's My Age? is a convenient app for anyone who needs a quick and easy way to check their age.