Are you assuming the shocks on the OP’s 1998 Buick are shot?
Or are you just saying that, from a statistical standpoint, it’s probable?
None of us . . . except OP . . . has driven the car and I’m unwilling to assume they’re shot, just because the car is old
While we’re at it, we could make all sorts of other assumptions about the car, and undoubtedly some of them will be incorrect