who was the eldest actor to play james bond connery, lazenby, moore, dalton, brosnanan, or craig?

Answer 1

Of the "official" Bond movies that honor would go to
Roger Moore. He was 45.
If you are referring to the "unofficial" Bond movies that would go to David Niven who was 57 when he made " Casino Royale" which was a spoof of all the spy movies around but most famously James Bond movies.

Answer 2

Sean Connery in "Never Say Never Again" (1983)

He was 53 at the time

or if you count comedies

David Niven in "Casino Royale" (1967)

He was 57 at the time.