The age of the ESC is not too important if the wiring is still good, i.e., not dried out or cracked. I would be more concerned about the ESC having a battery eliminator circuit (BEC) with sufficient amperage capacity to preclude brownouts, especially if using modern digital servos. Older ESC's often had linear (straight resistance) BEC's of questionable capacity. I would recommend an ESC with a switch-mode BEC capable of at least 6 amps for your purposes. Modern digital servos may have low average running amperages but they pull very brief but high peak instantaneous starting amps (essentially locked-rotor "stalled" current) which can damage the BEC over time, or cause low-voltage brown-outs (see attachment). Castle is known for high-end ESC's and are high priced... way over-priced for my needs. I have used several sizes of Hobbywing ESC's over the years and enjoyed good service from them... never had one cause a crash. The Hobbywing inventory includes some nice 60 and 80 amp ESC's. Here is a link to a suitable 60 amp ESC with an 8/20 amp (continuous/peak) switch-mode BEC which should serve you well.
https://www.altitudehobbies.com/coll...series-60a-esc