Mickey Mouse's 60th Birthday At MAH, 1988, Smithsonian Archives - History Div, From left, the Disney Studio's Michael Eisner, American History Director Roger Kennedy (sporting a special T-shirt celebrating Mickey Mouse's 60th birthday), Walt Disney's nephew Roy and Mickey Mouse joined in a celebration at National Museum of American History. During the festivities, six of the earliest drawings of the 1928 animated cartoon "Steamboat Willie" were donated to the Museum..