Sensors, ignition module, fuel pump... The parts that may leave me stranded...
If they're not causing any issues, I would continue to run them. As the old saying goes, "If it ain't broke, don't fix it".
I'm driving a 1991 F-150 pickup I bought new 31 years ago. I totally trust it. It's had a new radiator, (1998), new water pump, (2004), new shocks, (twice + the originals), and spark plugs, wires, rotor, and cap at regular intervals. And a new Serpentine belt every 35,000 miles or so. As well as coolant flushes and oil and filter changes. (Every 6 months). But everything else is original.
But other than that I don't replace anything that doesn't need it. Pretty much anything can leave you stranded. But if you think about it, how many people do you see stranded on the side of the road today? It's nothing like the 50's and 60's.
Newer cars, (say from 2000 on), are pretty dependable overall. I would happily motor on and not worry about it.