President Emmanuel Macron and far-right rival Marine Le Pen will battle for the presidency in a repeat of their 2017 run-off, but the results of the first round show changing dynamics in French politics and society.

AFP looks at five things we learnt from the election, which was a devastating disappointment for some of Macron’s rivals but also has uncomfortable aspects for the president despite polls giving him an edge for the second round on April 24.

For a president who is just 44-years-old and who came to office in 2017 as France’s youngest modern leader, it is striking that Macron lagged among young voters on Sunday.

Over a third – 34.8-36 per cent – of people aged 18 to 24 voted for far-left third placed candidate Jean-Luc Melenchon in the first round, with just 21-24.3 per cent backing Macron, according to surveys by Harris Interactive and Ifop.

Among the 25-34 age group, he fared even worse, with just 19.3-21 per cent backing the incumbent, behind both Le Pen and Melenchon.

“It’s a generational phenomenon,” the head of Macron’s party in parliament, Christophe Castaner, told BFM television, adding that he hoped young people would be “mobilised” by environmental issues.

However, surveys showed that amongst the oldest generations, Macron was by far the most popular candidate.

The first-round electoral map of France shows glaring geographical splits, with Le Pen coming out on top in the industrial north of the country and on the Mediterranean coast, where the far right counts on support from many so-called “pied-noirs” born in Algeria under colonial rule and their families.

Macron by contrast came out on top in a swathe of territory in the relatively affluent west of France as well as the centre and eastern regions on the Swiss and German borders.

Melenchon was the leading candidate in several areas in Paris and its region, and in French overseas territories in the Caribbean.

In a nod to the need to find new reservoirs of support in the second round, Macron on Sunday visited Denain, a small town in France’s northern rust belt, where he came only third on Sunday behind Le Pen and Melenchon.

Melenchon finished just over a percentage point behind Le Pen in the final reckoning, after a late surge in the final days of campaigning.

This prompted some to wonder what might have happened if the French left had rallied behind Melenchon as the most successful candidate, instead of having a plethora of other leftist candidates.

Socialist Anne Hidalgo, Green Yannick Jadot and Communist Fabien Roussel all won less than five per cent on Sunday, but if thoses votes had gone instead to Melenchon, he might have reached the second round instead of Le Pen.

“We felt an expectation of a left-wing alliance but they could not, due to their egos or lack of forward thinking,” former Socialist presidential candidate Segolene Royal told BFM.

“If they had pulled out then Jean-Luc Melenchon would be in the third round,” she said.

The Republicans party is the right-wing political faction that brought former presidents Jacques Chirac and Nicolas Sarkozy to power and dominated French politics for years.

However, its candidate Valerie Pecresse polled only 4.8 per cent in a campaign shadowed by the refusal of Sarkozy to endorse her candidacy.

Adding insult to injury, the party now faces a financial crisis as only candidates who score above five per cent have their expenses reimbursed by the state – Pecresse on Monday appealed for financial help from supporters.

“This is about the survival of the Republicans, and beyond this, the survival of a republican right-wing,” she said, adding that she was personally indebted to the tune of five million euros ($5.5 million).

In neighbouring Germany, the Greens are part of the government, have long paid a central role in national politics and hold the posts of foreign minister and economy minister in the cabinet.

Success in local elections in France has seen the Greens holding major cities including Bordeaux, Lyon and Grenoble but this success has never been transferred to a national level.

These elections marked no breakthrough, with its candidate Yannick Jadot failing to break the five per cent barrier and leaving his party mired in the same financial crisis as the Republicans.

“Ecology will be absent from the second round,” Jadot lamented after his defeat was confirmed.