He was ordained in 1958, so I'm guessing about 90 or so. I don't know about any other priests like him.
You beat me to it. I wasn't sure if it was late 1950s or early 1960s. I believe he's 89 going on 90 ... and still active, offering daily and Sunday Mass like clockwork at 9:00 AM. I don't think he's missed a day, even for illness, in the 35+ years I've known him ... except when he had hip surgery (from which he bounced right back). He also offers 7:00 PM Mass on Holy Days of Obligation (outside of Sundays) and until just a few years ago used to travel to Wheeling, WV every Sunday afternoon.
Father Carley is very much of the Resistance mindset. He positively holds the NO Holy Orders and NOM to be invalid. I recall a story told to me by another older priest who's still in the Cleveland Diocese (who's about 88 himself) where he tried to take Holy Communion at a hospital to one of the faithful at Father Carley's chapel and Father Carley told him to stop bringing his idolatrous cookie to his faithful.

Father currently intends to leave his chapel to SSPX, mostly for practical reasons, because he feels that's the best chance the faithful there would be taken care of. I was on his Board of Trustees when he asked us to sign the papers, and I very politely and respectfully resigned rather than to sign, because I warned Father Carley that, with the proximity to St. Peregrine's (SSPX), the SSPX would undoubtedly sell his property and just tell everyone to go to St. Peregrine's. He just felt he didn't have a better option. Back in the old days before the SSPX episcopal consecrations, Father would obtain his Holy Oils from Bishop McKenna. I feel that the Resistance might do well to contact Father Carley, now that they're growing, since he has a chapel, a school building, a large parcel of land, and also owns several homes adjacent to the chapel.
When he was going to be out for hip surgery, he asked SSPX to fill in (and his absence included Christmas Day). SSPX said they would have a priest stop by for a 3PM Mass on Christmas. Father was very upset by that and called them, threatening to not leave them the property. So we walk in on Christmas Day for the 9AM Mass only to find Bishop Tissier coming out from the sacristy to offer the Mass ... at 9AM.