Get used to it

Young man, in mathematics you don't understand things. You just get used to them.

-- John von Neumann
quoted in The Dancing Wu Li Masters (1979)

Old age

Father used to say, the only thing for old age is a brave face, a good tailor and comfortable shoes.

Alan Ayckbourn
Table Manners (The Norman Conquests) 1973
Act II, Scene 1