I’m of the opinion that a daily driver should be as safe as reasonably possible, so I wouldn’t consider one so old that it doesn’t have side curtain airbags. With a project/track car, however, I’d be the first to rip out airbags to save weight.
After 15 cars, most of them used, I’ve decided I prefer the fit, finish, technology, etc. of a brand new car. It’s worth the premium to me. It’s also nice knowing where they’ve been. With performance cars, you never know what’s been done to them. I always trade before reaching 100k.