I'll turn 43 this summer and I have no problems competing in open.
(Elite isn't that dependend on ultra-quick reflexes, nothing a good KB+M and a pip macro can't solve

)
I jest I jest, if you're comfortable stay in Mobius, but open isn't the hellhole some tell about.
Open IS a mode where your decisions have consequences though.
Jump to Deciat in a 3D shielded Asp, and even lightning reflexes won't save you most of the time.
Put some thought into your build and what you do, and survival is not a problem.