[flybouy]

It's not just age but also milage and how that milage was obtained, i.e. road surfaces, weights, driving habits, and environmental variances. Worn mounting points and bushings can have a very large impact on handling. Even worn out cab mounting bushings can have a large effect to say nothing of transmission crossmembers, motor mounts,etc. It's not only springs and frame but a "system" of body, driveline, and suspension.