(A) All-cause mortality across different Age-Gap categories. Curves adjusted for chronological age, sex, current smoking, diabetes history, hypertension history, systolic blood pressure, dyslipidaemia history, total cholesterol, heart failure history, and body mass index. A positive Age-Gap means subjects’ electrocardiogram-derived ages were older than their chronological ages. In this figure, this includes 2+ SD above and 1–2 SD above. A negative Age-Gap means subjects’ electrocardiogram-derived ages were younger than their chronological ages. In this figure, this includes 2+ SD below and 1–2 SD below. (B) Cardiovascular mortality across different Age-Gap categories. Curves adjusted for chronological age, sex, current smoking, diabetes history, hypertension history, systolic blood pressure, dyslipidaemia history, total cholesterol, heart failure history, and body mass index. A positive Age-Gap means subjects’ electrocardiogram-derived ages were older than their chronological ages. In this figure, this includes 2+ SD above and 1–2 SD above. A negative Age-Gap means subjects’ electrocardiogram-derived ages were younger than their chronological ages. In this figure, this includes 2+ SD below and 1–2 SD below.