Singapore's roads, while generally well maintained, have enough speed humps, kerbs and uneven surfaces in car parks and minor roads to put cumulative stress on the front suspension of any car.
A shock absorber works by converting the kinetic energy of suspension movement into heat inside a hydraulic fluid chamber. Over time, the piston seals inside the absorber degrade, the fluid loses its viscosity, and the damping force drops. The wear is gradual, which is why many owners only notice it clearly when they drive a car with fresh absorbers and realise how different the ride used to be.
The anti-roll bar linkage is a simpler component, essentially a short rod with rubber or ball joints at each end. The ball joints wear with use and the rubber bushes harden with age. A worn linkage produces noise over bumps and reduces the effectiveness of the anti-roll bar.