You wrote specifically about "left-wing" politicians.
That is still the trend. In the USA "According to the most recent estimates from the U.S. Census Bureau, the average age of first marriage for women in 2017 was 27.4 years. For men, it's slightly older at 29.5 years." (
https://www.womenshealthmag.com/rela...e-of-marriage/) and here in the UK similarly there has been a consistent trend for the average husband to be three years older then the average wife from the 1950's to today. (
https://www.ons.gov.uk/peoplepopulat...ovisional/2015)
The whole idea that Macron and Trudeau both chose to marry older women (a barely noticeable 4 years older in Trudeau's case) primarily as strategies to appeal to voters seems preposterous on the face of it.
SW