Lǎorén de miǎnyìlì xiāngduì jiào ruò, gèng róngyì shēngbìng.
Elderly people have relatively weaker immunity and are more prone to illness.
Tips
usage
免疫力 literally means 'immune power/strength'. Common collocations: 增强免疫力 (boost immunity), 降低免疫力 (weaken immunity). 免疫系统 is the broader term for the immune system.
