The title of this post is a so-called primrose path sentence, which, though it appears nonsensical at a first glance, is actually syntactically right.
The snag is that "man" is the verb, there is a verb "to man," ergo:
THE OLD (s.) MAN (v) THE BOAT (o).
The sentence means that the crew on the boat consists of old people. In Spanish, it would be LOS ANCIANOS TRIPULAN EL BARCO.