Workers over the age of retirement helped to generate £61bn for the UK economy last year, according to new figures from charity Age UK.
Over 65s contributed via employment, informal caring and volunteering, Age UK said.
The Age UK Chief Economist's report found that £37 billion of the total amount came from employment and £11.4 billion from informal caring.
Childcare contributed £6.6 billion and nearly £6 billion came from volunteering.
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Six-month-old Leena Belkadi and her sister Malak Belkadi, aged eight, both died from inhalation of fire fumes, an inquest has heard.
The true number of those believed to be dead or missing and presumed dead following the fire won't be known until the end of the year.