Rear Suspension Shock Absorber problems of the 2010 Nissan Altima

During a routine service I was told that the shock absorbers were in need of replacement. Since this is a critical part of the car in terms of stability and since there was only 39000 miles on the car I thought it was likely a fault in manufacture. I am a senior citizen and only drive on well paved roads and highways. I do not pull a trailer or the like. I contacted Nissan about this but they declined to take action. I am concerned that this might represent a safety hazard for others who may not have this defect discovered.