No problem. Just give each the same amount of maintenance. For a car, that means changing the oil, brake pads, rotors, rad fluid, and a few other consumables several times over that 10-15 years.

For routers, most should be good for 10 years with no maintenance, or 20 years if you change the caps once.

But yeah, I get where you're coming from.
And so does the motherboard industry, at least -- better ones now use "solid" caps instead of the liquid/gel electrolytic variety. Should be good for the full 15 years or so, unless overheated.

Cheers