How old is too old for a Dac?


Been out of the loop for a good bit, and wondering how much things have changed in digital. In other words, how old is too old for a dac?
spoogemonkey
@ redmosessc

Interesting story. Glad you were able to take that risk and win big. And it really says something about old vs new tech. 
The Redgum sounding very good doesn’t surprise me.  Solid engineering principles are to a large degree timeless.  Well thought out robust power supply and  quality analog output stage are essential to obtain upper tier sound performance. 
Charles 
Great find redmosessc!  A lot of great older used DAcs available for one playing redbook cd files and owning a good USB/SPDIF converter. I currently own four non USB DACs and two converters. 
@ charles1dad

Makes sense. Though not sure how one would go about discerning one from another unless one happened to be privy to the materials used.