I feel like Kurt Loder and David Fricke (who's gonna be 68 this month) are ageless. It probably has a lot to do with me being a pretty voracious consumer of music criticism; I began reading Rolling Stone in the mid-70's, so these guys have been on and off my radar for 45-ish years.
I remember seeing Loder when he started on MTV and thinking, "Wow, they got a legit rock critic on here".