It's really generous to support the old model phone like that.
Apple published a support document for iPhone5 owners, remind them to update their iPhone5 to ios 10.3.4, otherwise, you could no longer use App Store, iCloud, email, web and other services.
Due to the GPS time rollover issue that began affecting GPS-enabled products from other manufacturers on April 6, 2019, iPhone 5 needs to update for ios 10.3.4 to maintain accurate GPS location for the correct date and time in App Store, iCloud, email and web browsing. Affected Apple devices are not impacted until just before 12:00 a.m. UTC on November 3, 2019
(TOPGO Cup Holder Phone Mount grip securely an iPhone 5 in the car)
“It's always a good idea to keep the operating system on your iPhone updated. If you have an iPhone 5, it's especially important to update your device's software wirelessly or using your computer before November 3 to maintain accurate GPS location and to continue to use functions that rely on correct date and time including App Store, iCloud, email, and web browsing.
If the update to iPhone 5 is not completed by November 3, 2019, you will be required to back up and restore using a Mac or PC in order to update because over-the-air software updates and iCloud Backup will not work.”
Update your iPhone 5 now!
(The updated software version number should be 10.3.4).