What does "minimal voltage criteria for lvh,may be normal variant" on ecg mean?

Computer jargon: In patients over the age of 40 the amplitude of the QRS wave on the ECG measured in different sectons of the ECG has a high probability of accurately predicting abnormal thickening of the heart muscle, a condition common in people with longstanding high blood pressure. Under the age of 40 these criteria lose their predictive power and may or may not accurately predict this problem. ie I bet all ok