Typical lifespan for a 5 channel power amp?

I have an Adcom 7400 or 7500? What a work horse.. I took the top off a few yeas back before I stored it.. All the modules looked great.. Sounded great for a 5 channel. I used it to biamp a pair of DIY shop speakers for 15 years.. 40 yeas old at least.. The channel that was left over powered 2 15" pro subs with ease.. That was a great work place system.. Serious Christmas Parties.. LOL

I have had some amps for decades. I have never had one go out. My current Rotel 5 channel has been operating in the same cabinet for nearly 20 years.

With multi channel HT amplifiers the technology becomes obsolete before the operational lifespan. 

Thank you for all the great advice folks! I always appreciate and value the time and opinions of those of you here that take the time to respond and help...You have definitely boosted my confidence level and I am leaning heavily towards keeping and just enjoying (continuing to enjoy) this magnificent unit. Back in the day it was my "dream" piece when it first came out but I could not afford it. So I ended up going with Rotel RMB1095, @ghdprentice :)...I LOVED that amp and only sold it because of my divorce. But getting this unit was a dream come true, especially for the price. Honestly I almost felt guilty especially when I saw it. But again I was willing to drive (4+ hours) and offered cash in hand so he relented after trying to negotiate a bit but I wouldn't go above the 3K...

Much as I would have hated to sell the Simaudio (interestingly Dynaudio actually recommends Simaudio gear as an excellent match with their speakers-and I currently have Dynaudio Evoke speakers), it is getting up there in age and I was a bit concerned that maybe best to make a move before it's life cycle comes to an end and I really had no idea of the typical lifespan. I will say that in the 1 year + I have had it it barely gets even lukewarm even after running all day long. There was only 1 occasion where it was actually a bit on the hot side to the touch but that was after running all day in 5 channel stereo mode at pretty loud levels...

Once again thank you all for taking the time to respond :)

Honestly, that amp will likely outlast you. The only parts that have a shelf life are the caps, and they will typically last 30 years or more (the dielectric can dry out). I stress "or more" because that 30 year figure is just an estimate. Cool running, overbuilt amps like the Titan will likely last much longer then 30 years before there is any noticeable degradation in sound quality. Enjoy it! The caps can also be replaced at a fraction of the cost of a new amp. My W3 is around 20 y/o and still going strong. Dead quiet, no hums whatsoever, and used daily. Congrats on the deal, that is a heck of a HT amp. I also use Dynaudio speakers.