The lender said research demonstrated people were living longer which meant landlords wanted to keep their properties for a longer period into retirement.
Barclays has identified an increased appetite from applicants over 50 years of age to invest property which influenced its decision to raise its upper age limit.
A maximum age limit of 70 still applies to its residential mortgage range. In November, the Building Societies Association began a 12-month review into age caps on mortgage lending in the mutual sector. Since then Cambridge and Dudley Building Societies have removed their upper age caps.