is a
person with a smooth, shining crown and a fringe of scattered white
hairs, seen in the streets on sunshiny days, stooping as he walks,
bearing a cane, moving cautiously and slowly; telling old stories,
smiling at present follies, living in a narrow world of dry habits; one
that remains waking when others have dropped asleep, and keeps a little
night-lamp-flame of life burning year after year, if the lamp is not
upset, and there is only a careful hand held round it to prevent the
puffs of wind from blowing the flame out. That's what I call an old man.

Now, said the Professor, you don't mean to tell me that I have got to
that yet? Why, bless you, I am several years short of the time when--[I
knew what was coming, and could hardly keep from laughing; twenty years
ago he used to quote it as one of those absurd speeches men of genius
will make, and now he is going to argue from it]--several years short
of the time when Balzac says that men are--most--you know--dangerous
to--the hearts of--in short, most to be dreaded by duennas that
have charge of susceptible females.--What age is that? said I,
statistically.--Fifty-two years, answered the Professor.--Balzac ought
to know, said I, if it is true that Goethe said of him that each of his
stories must have been dug out of a woman's heart. But fifty-two is a
high figure.

Stand in the light of the window, Professor, said I.--The Professor took
up the desired position.--You have white hairs, I said.--Had 'em any
time these twenty years, said the Professor.--And the crow's-foot,--_pes
anserinus_, rather.--The Professor smiled, as I wanted him to, and the
folds radiated like the ridges of a half-opened fan, from the outer
corner of the eyes to the temples.--And the calipers, said I.--What
are the _calipers_? he asked, curiously.--Why, the parenthesis, said
I.--_Parenthesis_? said the Professor; what's that?--Why, look in the
glass when you are disposed to laugh, and see if your mouth isn't framed
in a couple of crescent lines,--so, my boy ( ).--It's all nonsense, said
the Professor; just look at my _biceps_;--and he began pulling off his
coat to show me his arm.--Be careful, said I; you can't bear exposure to
the air, at your time of life, as you could once.--I will box with you,
said the Professor, row with you, walk with you, ride with you, swim
with you, or sit at table with you, for fifty dollars a side.--Pluck
survives stamina, I answered.

The Professor went off a li