I am currently reading "A Study in Scarlet" by Arthur Conan Doyle. On page 33 is a sentence I don't understand:
Well, if a man can stride four and a-half feet without the smallest effort, he can't be quite in the sere and yellow.
What does "in the sere and yellow" mean?
Note: It seems to be related to this part of Macbeth:
I have liv'd long enough: my way of life
Is fall'n into the sear, the yellow leaf;
And that which should accompany old age,
As honour, love, obedience, troops of friends,
I must not look to have; but, in their stead,
Curses, not loud but deep, mouth-honour, breath,
Which the poor heart would fain deny, and dare not.