A quick search and I was surprised to find many people who have gotten 200k miles on original plugs (Camrys, Mazda, etc). Even if they are still working the gap is probably way off. I would change them. if you are considering DIY and have never changed plugs I would recommend having a reputable shop do it. I did my own and it’s not difficult. The issue you have is the age and miles that they have been in there will require special attention. The aluminum head and spark plugs have dissimilar metals which can cause corrosion and be difficult to remove without stripping engine threads or breaking the plugs. Prob need to use pb blaster and use just the right amount of force to get them out. Only buy new plugs from a reputable source. Amazon and eBay have counterfeits! I got mine from rockauto.com for 1/3 price of dealer.
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