REFILE-Not your father's Peronists: Why Macri flopped with young Argentines

(In Aug. 18 story, refiles to fix typo in word "cachet" in paragraph 17)

By Cassandra Garrison and Marina Lammertyn

BUENOS AIRES, Aug 18 (Reuters) - For Luis Joaquin Caro, who was about 2 years old when Argentina last defaulted on its debt in 2001, casting his vote for left-leaning Peronist candidate Alberto Fernandez in the country's recent primary election was a no-brainer.

"During the Kirchner years, I lived very well," he said, referring to what now seems like a bygone era of his young life before four years of spending cuts and austerity measures under President Mauricio Macri.

"Today, it's not like that," said Caro, who is from a working-class part of Buenos Aires Province. The 21-year-old said he had always seen former President Cristina Fernandez de Kirchner and her late husband former President Nestor Kirchner - whose consecutive terms spanned 2003 to 2015 - as champions of the workers.

Cristina Kirchner, a polarizing figure in Argentina, is the running mate of Fernandez, whose landslide victory over Macri in the Aug. 11 primary wrong-footed pollsters and shocked investors, who worry that Argentina may fail once again to pay its debts if the left returns to power.

Argentine markets plunged into a nosedive last week amid growing fears about a rerun of "Kirchnerismo", when Argentina had currency controls and other interventionist policies.

Caro's sentiments are emblematic of a groundswell of support for Fernandez among younger voters which, while not altogether unexpected for pollsters, shocked them in its magnitude.

Part of the challenge for pollsters in Argentina was that young voters, one of the demographics most impacted by high unemployment, are less likely to have a conventional phone where canvassers can reach them - a factor also cited by polling firms in Britain and the United States after upsets in recent years.

For Caro and many other young voters in Argentina, talk of the pain surrounding the 2001 crisis was eclipsed by generous social benefits and subsidies under the Kirchners' that helped pluck their families from poverty after the debt default.

"The years of Kirchnerism that I lived during my childhood, I lived very well and maybe at that time, I did not realize it," said Lucila Servelli, 16, who voted for the first time on Sunday, though voting is not compulsory for 16 to 18 year olds.

"But comparing it with now, many things have changed. Now, my family had to give up many things," said Servelli, who was not born when Argentina defaulted in 2001.