Well this may be a biased sample, but here's a list of Kings and Queens of England/the UK from 1509 to 1901, and their respective life expectancies:

Henry VIII: 55

Edward VI: 15

Lady Jane Grey: 16 (beheaded)

Mary I: 42

Elizabeth I: 69

James I: 58

Charles I: 48 (beheaded)

Cromwell: 59

Charles II: 54

James II: 67

Mary II: 32

William III: 51 (from injury)

Anne: 49

George I: 67

George II: 76

George III: 81 (despite suffering from porphyria throughout his life)

George IV: 67

William IV: 71

Victoria: 81 (although her husband died very young from drinking water from a leaky toilet)

TL;DR it seems everyone just died younger, at least until the 18th century.