Australia and NZ had much more successful conversions to the metric system than Canada but there are people alive today who would have used the Fahrenheit scale early in their lives. Contrast this with non commonwealth countries who converted to the metric system 100 years earlier than the commonwealth.

UK Metrication: 1978 (partial)

Canadian Metrication: 1976 (partial)

Australian Metrication: 1988

NZ Metrication: 1976

French Metrication: 1858

German Metrication: 1872

Mexican Metrication: 1857