Old people have faults of their own; they tend to become cowardly, niggardly, and suspicious. Whether from the growth of experience or the decline of animal heat, I see that age leads to these and certain other faults; and it follows, of course, that while in one sense I hope I am journeying towards the truth, in another I am indubitably posting towards these forms and sources of error.

Robert Louis Stevenson (1850-1894) Scottish essayist, novelist, poet

Essay (1878-03), “Crabbed Age and Youth,” Cornhill Magazine, Vol. 38
    (Source)

Collected in Virginibus Puerisque and Other Papers, ch. 2 (1881).