Sweat offers a variety of biomarkers, such as sodium, potassium, and lactate, that correlate with blood levels, making it a promising alternative to invasive methods like blood draws, which often cause discomfort in patients. Since seniors naturally have a decreased ability to sweat, two iontophoresis electrodes on the patch can induce an unnoticeable one mA current to stimulate sweat glands and draw tiny amounts of sweat into a microfluidic channel. An electrochemical sweat sensor operates by using electrodes coated with specific chemical receptors that react with these biomarkers, producing an electrical signal that is measured and analyzed. The sensors are printed on flexible PET substrates and use very small amounts of silver and carbon for the electrodes. Roll-to-roll printing processes are very cost-effective, making the patches accessible and affordable since the receptor is typically used for two to three days.