1) Change in ability to walk, which triggers 2) Inability to take care of and feed themselves, which triggers a slew of medications to try to combat 3) Inability to go to bathroom by themselves
Keep people moving. Build strength early - strength training is great (people begin losing strength as early as 50's and it dominos). Eat more healthily earlier in life and continue (when a person cannot cook for themselves, they tend to eat high salt, high fat, frozen foods - which becomes less healthy). Also, look into assisted policy care insurance.