How long should components last?

I had a Rotel amp and preamp, a Velodyne sub and B&W speakers last 23 years without a single repair to any of the components. So, I expect 23 years out of my current system. Fingers crossed!

A bad tube can cause other components to fail. I had a a rogue st100 amp where a bad tube took out a resistor and some other parts. Luckily I’m about an hour away from Rogue and was able to drop it off. It was fixed promptly. 
CD Transports can fail. I had an ARC CD3 Mk2 that stopped reading discs. ARC fixed it. It happens. 5 years is early though. 
As to German cars. I love BMWs but they gradually start acting up after 5 years. I traded in a 5 recently when it began showing signs of trouble. Amazing performance though. The 5 years of pure joy is worth it. At least to me. 

I am also curious about what brand these components are. I see no reason not to list it. Maybe just an outlier, or maybe there's a pattern, so that info would be helpful.

I've got components older than my adult children which are still going strong. Things with moving parts will sometimes need maintenance like speaker surrounds or CD belts. I consider those more like brake pads or tires on a car which aren't a surprise, they wear with use and age. Anything else would just be the occasional capacitor failure, CD laser, or other simple things, which I consider more like a water pump or timing belt that also has a shelf life. 

Long established American brands are the best bet. Many pioneered the industry and are still with us after 80+ years. Evan companies that folded decades ago still have very solid examples from the 1950s and 1960s still in widespread use and are running strong and still sounding great. I think there are very few brands from outside the United States that can boast such a track record. The Japanese still have to prove themselves since we have at least a twenty-year head start on them.

Yes they were the same brand. And are from Austria thus my allusion to German luxury cars which after having spoken to a number of mechanics are infamous for their lack of reliability and the not the wisest decision in purchasing a car. But I guess if you have the money and buy them new and after 5 they go down you can buy another the pleasure in driving them is worth it.

For some reason we believe that Germans and Austrians are the best in taking great pride in their products. It seems actually anything but. To be worthless after 5 years seems a bit much.