Arcana Coelestia #3497
3497. 'He said, Behold now, I am old' means that the state was reached. This is clear from what has been stated above, in 3492, about the meaning of 'growing old'.
Smooth
'Smooth' relates to truth, and in an opposite sense, to what is false.
(Referenties: Arcana Coelestia 3527)