golfnut
Full time employment: Posting here.
Most consumer tech items like this are designed for about 3 to 5 years. Some fail early, some go on forever. You are getting on the long end of it working OK (power supply, capacitors, etc).
However, I'm more worried about the software and settings in your case. The default settings and operations of routers have progressed quite a bit in 10 years. By default, they tend to stop the worst of hacker attacks. Your 10 year old router probably is wide open in comparison.
At 10 years, start your search for a replacement. It is time.
Thanks for the response - did not know this. Now I'll start to look for a new one. Wish I knew what features/specs to look for (w/o breaking the bank).