How does he show that he has lived a long time alone?

From the text:

I could now see that he was a white man like myself and that his features were even pleasing. His skin, wherever it was exposed, was burnt by the sun; even his lips were black, and his fair eyes looked quite startling in so dark a face. Of all the beggar-men that I had seen or fancied, he was the chief for raggedness. He was clothed with tatters of old ship's canvas and old sea-cloth, and this extraordinary patchwork was all held together by a system of the most various and incongruous fastenings, brass buttons, bits of stick, and loops of tarry gaskin. About his waist he wore an old brass-buckled leather belt, which was the one thing solid in his whole accoutrement.