This is the part that director Todd Philips and co-producer Martin Scorsese are apparently looking to De Niro to fill.
As a 74-year-old Caucasian, the Taxi Driver actor does technically fit the description of the character, so it is possible De Niro could take the part, though far from certain.
I would tell you to take this was a massive grain of salt but you might want to take this one with the entire salt shaker to be safe.
Among the numerous character descriptions, which are, in themselves fairly vague, is the vaguest among them, a character named Murry Franklin who is described as a Caucasian between 65-75 years of age.