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Current mileage 137,600
Plugs, boots and springs (I think the springs) were replaced at 90k in 2006....yes 2006.
Plan is to retorque plugs.
While I'm already suffering doing this work:
1) should I replace plugs instead?
2) boots?
3) springs?
4) anything else?
I won't ask about replacing COPS. No issues but I feel like replacing.
With 47K on the current plugs, I'd just go ahead and replace them since you're going through the work of "re-torquing" the plugs. Plugs are only 4 bucks apiece. I'm in the 28 in-lbs with no anti-seize camp, FWIW.
Make sure that you use some more dielectric grease when reassembling. Inspect your boots and replace any boots/springs that look degraded. I wouldn't waste money replacing serviceable COPS.