The charities had confirmed that Agenda was being considered as a name for the organisation, which was formed in April under the temporary name Age UK.
But a spokesman this week told Third Sector that Agenda had been dropped.
"We are now finalising our new brand name after consultation with our partners and older people," he said. "As yet there is no final decision, but we have ruled out Agenda as a name for the organisation."
He was unable to confirm when the name would be revealed, although he said it would start to be used in the "early part of 2010".