President Joe Biden holds a note card before delivering remarks. His use of cheat sheets has recently sparked some concerns from donors, according to a report.Mandel Ngan/AFP via Getty ImageDonors have expressed concerns with President Joe Biden's reliance on note cards, per Axios.They viewed the cheat sheets as another sign of Biden's old age, per the report.Presidents have long relied on prepared notes to address their constituents, historian says.At a recent closed-door fundraiser, President Joe Biden had to rely on note cards prepped by his staff to provide donors with detailed answers on his policy.This, according to Axios, had some donors concerned: Is Biden's age showing again?Media gaffes and, more recently, a damning report from special counsel Robert Hur that questioned the president's memory have fueled speculation about Biden's ability to lead at the age of 81 — and for another four years if he is elected in November.