It's about 6 years old. Been a great phone and still works well for my use. Google Play store shows lots of AntiVirus apps that will work on this phone. Looks like the top 3 rated Android AntiVirus apps in the Google Play Store are: AVG, Avast and Bitdefender. Of the 3, Bitdefender doesn't share info with 3rd parties whereas AVG and Avast do.
This articles shows Bitdefender rating well, so maybe I'll give that a try.
The need for effective antivirus for Android devices has never been more apparent. With a rise in security threats targeting mobile platforms, many users are looking to safeguard their devices. While the focus often shifts to personal computers and Macs, the Android operating system faces its own se
www.forbes.com