The architecture of a DAC can matter too. Many on here have bought 8+ year old PS Audio Perfect Wave DACs from The Music Room, or direct from PS Audio, and say they sound great for the money - even compared to new DACs costing about the same. They were on close out or refurbed because their newer one is now out. They use an FPGA chip which had a firmware update a year or so ago making them sound great, especially at ~1/3rd the original price.
My only concern is that well, everything will at some point wear out, but we hopefully can assume that modern quality devices made since 2010 use capacitors that don't change value over time and they should last decades.
