Probably more connected with how much oil and AVGAS is left. Off the top of my head (Fluffy will be able to give the correct answer) the re-spar and limited hours should give a minimum of 50 years to the airframe… although its never that simple….

That re-spar was some 15 years ago now 😮

IIRC, at the time just afterwards, yes, BBMF did say she’d be good for another 50 years, but that it was more likely that she’d be grounded before that due to the lack of AVGAS.