iTunes no longer recognizes my iPhone 6s
I have an early 2011 Macbook Pro, so I'm unable to install Mojave. My operating system right now is OS X Yosemite 10.10.5
When I connect my iPhone 6s (updated to 12.1.3) to my computer, iTunes says I need to upgrade to Mojave (which I'm unable to do with my 'elderly' Macbook).
Do I have any options? Am I out of luck just because I have an older computer?