Many adult children assume they would immediately recognize when an aging parent is seriously sick. In reality, infections in older adults often look very different from those in younger people, and many seniors actively hide symptoms because they fear losing independence or becoming a burden on family members. A urinary tract infection, pneumonia, skin infection, or even early sepsis may appear first as confusion, exhaustion, or personality changes instead of obvious fever or pain. Here are five key things that could signal a serious infection.