What is the average life expectancy of a DAC?


Hello folks, 

With the recent profusion of relatively inexpensive DACs that are now available, I'm wondering what the average life expectancy of a good DAC is? Or, to put it another way, is it cost-effective to invest in a high(ish) end DAC like a Denafrips Terminator or a Halo May with the expectation that it will last at least 5 or more years?

Thanks!  
aamiransari
All DAC's sound the same? Sorry, but my RME ADI-2 DAC does not sound like an iPhone. 
larshepping 

Ok, no reason to buy an external DAC at all if they all sound the same. Just use the DAC built into your computer or phone. End of discussion.
Why would they last any less than any other component? I'd say the guy that said 30 or 40 years is most likely correct. 
The answer is that DACs will last as long as you are satisfied with what you have (and it is still working). That could be 1 month or 30 years. YMMV.
My previous one lasted 15 years for me, and was used when I bought it.  It was a Chord DAC 64