Rich,
I'm 62, wear bi-focals and understand. Sometimes the green blends in with the ground - makes it doubly difficult to see. Red is always the enemy! You can adjust the colors - options, preferences, GUI - to make the colors stand out more. Make sure you get your views setup so you can see as much outside the cockpit as possible. Spend some time in the training arena, switch to external (F3) occasionally to get some perspective, then back to F1. This is a tough game to become proficient at - but if you stick with it, a ton of fun!
Regards,
Optiker