Well, if things go well, I get to join the 60 club this year...
As for age and record RPM speeds: rather than 78, or 45, or 33 1/3, how about the other attempt (that didn't last) of sweet 16?
Even more OT: There was a time long ago that I briefly collected old 78's... and among others had a Caruso recording on an old one-sided 78. It took a bit before they realized they could record on both sides. All of them are long-gone now.