How some hearts age.
D000368:Aged; D000375:Aging / Q000502:physiology*; D006321:Heart / Q000502:physiology*; D006333:Heart Failure / Q000209:etiology*; D006801:Humans; D006973:Hypertension / Q000150:complications; D006980:Hyperthyroidism / Q000150:complications; D008875:Middle Aged; D013610:Tachycardia / Q000150:complications