On a 24 yr old boat, it's more about maintenance and condition. Expect most mechanical things to work during the survey, and also expect to be replacing those same mechanical things within the next 3 years.
I'd be more focused on damage that can't be easily fixed, over all condition, softspots and water ingress. Expect a 10 yr old, or 1,000 hr gas inboards to be potentially close to needing a repower. Diesels are more like 5K+ hrs.