It's nice to keep old aircraft flying but I would not like to suffer the sad fate of the firefighters whose ageing ....what about the ancient Mallard amphibian whose wings collapsed shortly after take-off in Flordia a year or so back? All the fare paying passengers aboard were killed along with the crew.
Talent.
This is not about ensuring the ongoing airworthiness of the aircraft in terms of structure or engines, this is about adding highly expensive and impractical items to the airframe, which are pretty much irrelevant when operating 25 minute pleasure flights on nice days at airshows.