Spotting a low immune score in a seemingly healthy person could make it possible to identify and start treating an illness before symptoms appear, diseases worsen, or tumors grow and metastasize. Spotting a low immune score in a seemingly healthy person could make it possible to identify and start treating an illness before symptoms appear, diseases worsen, or tumors grow and metastasize. For instance, has a period of intense stress compromised the immune system, making it less able to fend off this season’s flu? But they weren’t able to measure them simultaneously, which limited visibility into how the immune system works as a whole. Shen-Orr’s result put the age of my immune system at around 57—still 10 years younger than my true age.