https://arstechnica.com/gadgets/2019/09/ios-13-on-the-iphone-6s-and-se-new-software-runs-fine-on-a-phone-thats-still-fast/

People upgrading to iOS 13 this year may have more of an incentive than usual to keep using their old phones rather than upgrading to new ones. After all, 2016's iPhone SE was the last Apple phone to include a 4-inch screen suitable for smaller hands and pockets, and both the SE and the 6S were Apple’s last phones to include conventional 3.5mm headphone jacks.