My wife and I are in our mid seventies. Recently she was prescribed a heart monitor to wear for 30 days. It's hard for me to imagine how other folks in their mid seventies have the physical strength and determination to use this monitor.
The heart monitor includes a sensor and a telephone monitor. Each have batteries that must be recharged. It came with six patches that hold the sensor in place. The patches have to be removed and replaced when the sensor battery is low. Removing the sensor from the cradle on the patch requires both physical strength and determination.
The patches must be positioned precisely on the patient's chest. The adhesive is like gorilla glue. We went through three of the six patches (and two calls to help) before the monitor worked properly. Each time that the patch was replaced it removed another layer of skin. An area about the size of her hand was both red and sore.
Even then the sensor didn't work properly until I used an ace bandage to apply continuous pressure on the sensor.
I pity those who are in their seventies whose doctor prescribes one of these heart monitors. Setting it up, getting it to work properly, and changing the patches so that the sensor battery can be recharged is an immense challenge.