I have that Sinatra: Portrait of an Album dvd (an old fashioned Sinatra fan’s old fashioned format for an old fashioned singer).
Now that I’m 79 I see that “he was age 69” and think that’s young and just fine for a recording artist.
Sinatra was irreplaceable.
His 1993 Duets album sold over three million in the US alone...Not bad for a 78 year-old.