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TPMS sensors are designed for an average 10-year life ... actual life will depend on use-case, including climate.
Denso (reputable) sensors from Rock auto are $50 ea
Based on the current driving style, they will fail prior to the next tire change, so do it now ... avoid the grief and potential damage associated with a replacement that is not coincident with a tire change.
Honestly ... I do not get the language around old cars without such things being better. Advance notice of leaks is valuable information ... for safety and for maximizing the life of the tire. When you move to low-profile tires, the "eyeball test" is no longer valid until the tire is damaged beyond repair.
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