"Early A" doesn't cut it

HemiSSDart said
Early A's are 60-66, Mid A's are 67-72, and late A's are 73-76, there I fixed it for you...

I can work with that if we must, if Early A's are 60-62. Mid A's are 63-66, Late A's are 67-72, and Modern A's are 73-76?