If you're 50+ I'm pretty sure you'll get your own race. Have fun! I'll probably be there too -- come by and say hi!

And from observation (i.e., talking out of my ass) of the Master 50+ races at Rock Hill, I think you'll be fine with the 92-94 that topflight pro mentioned. The wind also tends to be stronger right before the races start, which sometimes makes a gear feel too heavy for me, and then usually dies down as we start.