BARCELONA: A Spanish great-grandmother who was born in the United States is likely to become the world's oldest living person today at 115, a Guinness World Records consultant said on Wednesday.

Maria Branyas Morera is believed to have assumed the title following the death of French nun Lucile Randon at 118, said Robert D. Young, senior consultant for gerontology.

Guinness World Records must still make the official decision after carrying out document checks and interviewing Branyas Morera's family, added Young, also the director of the Gerontology Research Group's supercentenarian research database.

'We know what is likely, but it's not confirmed at this time,' he wrote in an email to Agence France-Presse (AFP).

Branyas Morera, who has lived through the 1918 Spanish flu pandemic, two world wars and Spain's civil war, was not available for interviews.

The Santa Maria del Tura nursing home in Olot town, northeastern Spain, where Branyas Morera has lived for the past two decades, said it would hold a 'small celebration' behind closed doors in the coming days to mark 'this very special event.'

'She is in good health and remains surprised and grateful for the interest that has been generated,' it said in a statement.

Branyas Morera's youngest daughter, 78-year-old Rosa Moret, attributed her mother's longevity to 'genetics.'

'She has never gone to the hospital, she has never broken any bones. She is fine, she has no pain,' Moret told regional Catalan television on Wednesday.

Branyas Morera was born in San Francisco, California on March 4, 1907, shortly after her family moved to the US from Mexico.

The entire family decided to return to their native Spain in 1915 as World War 1 was underway, which complicated the ship voyage across the Atlantic.

The crossing was also marked by tragedy: her father died from tuberculosis toward the end of the voyage, and his coffin was thrown into the sea.

Branyas Morera and her mother settled in Barcelona. In 1931 — five years before the start of Spain's 1936 to 1939 civil war — she married a doctor.

The couple lived together for four decades until her husband died at 72.

She has had three children, including one who already died; 11 grandchildren; and 11 great-grandchildren.

Just weeks after ringing in her 113th birthday, Branyas Morera got Covid-19 and was confined to her room at her care home in Olot, but made a full recovery.

'I haven't done anything extraordinary. The only thing I did was live,' she told Barcelona-based daily newspaper La Vanguardia in 2019.