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Four years old, but how many miles? Also, what engine and intake mods? What oil are you running? Pre-mixing? Without knowing, those look fine and I'd leave them in unless you're just doig PM, in which case, also replace your Cap and Rotor, Plug Wires and air filter, too.
The leading plugs have big, wide holes to fire through, which means they will pick up a lot more fouling and oil marking over time, making them a little darker. The trail in plugs fire through pin holes by comparison, so they usually come out looking more like what you'd expect. If you're not changing your engine oil and filter regularly, plugs will look like yours inside of 1,000 miles.
There are some who change plugs frequently hoping for best performance out of old ignition components. Truth be told, at the horsepower ratings these engines put out, those plugs work fine and will continue to work fine for many more thousands of miles, but plugs are cheap (*even at $6-7 each!).
Sorry for leaving out the info. They have about 6,000 miles on them, about 70/30 city to highway. It's a stock 12a, except a RB header which is about 500 miles old, if that.
No pre-mixing, OMP is still pumping.
The oil gets changed every 6 months, since I'd never hit the 3k OCI.
