I know you said this was for people with elderly parents, (I am 14) but my dad worries about his parents a lot and so does my mom. My mom's mom has had her hip replaced and has a slight limp, and my mom calls every once and a while to check up on her. Her husband, or my mom's dad, is slightly overweight and is on a special diet and my mom makes sure he keeps up on it. On the other side of the family, my dad's dad has been having heart trouble and has been to the hospital quite a few times. His wife, or my dad's mom, just recently was taken to the hospital and had test done because she was complaining of chest pain. Sorry if I violated the rules, but my parents share the same worry that you do.
~ILMAG