Heat pump age?

My Preston’s Guide doesn’t even list this one…ClimateMaster Model # DE06GSSS46DESA Serial # 92JO10915 House built 1975. I looked at a reference chart that says “Climate Master: Serial number indicates age from 1972 on” would that be “92”?
What say Ye?
Thanks in advance,

bump

I would be leaning towards 92, How ever ether way it is past the design life .or getting near .

Thanks Wayne, a Carston Dunlop resource confirmed “92”.