WASHINGTON (Reuters) - Vice President Kamala Harris, the Democratic presidential nominee, plans to make her medical information public on Saturday in an effort to draw attention to Republican rival Donald Trump's refusal to do so, according to a Harris aide.

The report about Harris' medical history and health information concludes: "She possesses the physical and mental resiliency required to successfully execute the duties of the Presidency, to include those as Chief Executive, Head of State and Commander in Chief," according to the aide.

Harris, 59, is running against Trump, 78, for the White House. The Harris campaign is eager to highlight the former president's age since he became the oldest candidate in the race after President Joe Biden, 81, stepped aside as the Democratic standard bearer following a poor debate performance against Trump.

The Democratic and Republican presidential nominees are locked in a very tight race. Harris' campaign hopes that contrasting her comparative youth and mental acuity with Trump's more advanced age and tendency to meander, along with the differences in transparency between the two, will help convince undecided voters that she is more fit for office than he.

(Reporting by Jeff Mason; Editing by Sam Holmes)