Some components too old now?


I have a traditional HiFi. Some bits are really old, but still working fine and I wouldn’t have a clue about updating even if I wanted to. Just wondering how long I can expect them to last, and whether I should pro-actively seek to update before there’s a catastrophic failure.
In particular, my CD player, pre-amp and DAC date back to around 1990, so these are about 30 years old now:
Marantz CD80 / Aragon 24k (with phono stage that I use) / Aragon D2A
Thoughts?
vinyloid
Of all the things mentioned I would say the DAC is the main piece I would upgrade and the CD player last. That or a an updated mid to high end CD player with a better built in DAC than something from 1990. 
Thanks for all your comments. Boiling it all down, it seems that the only thing I should consider is potentially changing my Aragon DAC.
Does anyone know much about the Aragon D2A? It has a separate power supply, and I remember that in its day it was considered one of the best.
Like you said, it was one of the best in its' day, but that was more than 20 years ago. I think you'll find just about any DAC built recently will be a significant improvement.
I found a link to another forum (hopefully allowed) asking the same question:
https://www.audiosciencereview.com/forum/index.php?threads/dacs-old-vs-new.3229/
B
Hmm. Thanks gdnrbob - really interesting.
Reading that thread, and over-summarising again, it seems as though a really good 90’s DAC (like the Aragon) will still sound as good as a decent modern one, but the difference is a modern one will have far more functionality. 
Is that the way you read it?
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