Heat waves threaten the old.
D000368:Aged; D000375:Aging; D001833:Body Temperature Regulation; D002318:Cardiovascular Diseases / Q000503:physiopathology; D006359:Heat Exhaustion / Q000503:physiopathology* / Q000517:prevention & control / Q000628:therapy; D006801:Humans; D006813:Humidity; D001523:Mental Disorders / Q000503:physiopathology; D008875:Middle Aged; D012306:Risk