The 39-year-old independent maverick is increasingly considered the front-runner in France's two-round April 23-May 7 presidential election. Polls suggest Macron could win over far-right leader Marine Le Pen, who is expected to score high after conservative candidate Francois Fillon lost ground amid corruption allegations.
Macron, a former French economy minister, is campaigning on pro-free market, pro-European views. And unlike many French politicians who prefer to keep their private life private, he is publicly appearing with his wife.
France's potential next first lady recently joined Macron on a campaign stage, kissing him and thanking the crowd in a Paris theater.
If elected, "she will then have this role, this place," Macron declared. "Not behind, not hidden ... She will be by my side."
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Macron and Trogneux have the same difference in age as US President Donald Trump, 70, and his wife Melania, 46 but the rarity of a much younger husband has drawn lots of attention.
Macron met Trogneux when he was 17 and she taught French literature in his high school in his hometown of Amiens. A married mother of three at the time, she ran the theater club that he belonged to.
A few years later, she divorced and joined Macron in Paris, where he completed his studies at the National School of Administration (ENA), one of France's most prestigious schools, in 2004.
In a video of their 2007 wedding, broadcast by French television, Macron thanked his wife's children for accepting him. He said they may not be "a quite normal couple even if I don't like that adjective much but a couple that exists."