How would you explain “five-and-thirty” in the last sentence? His face had undergone only tiny changes that had nevertheless worked a complete transformation. The black eyebrows were less bushy, the wrinkles were gone, the whole lines of the face seemed to have altered; even the nose seemed shorter. It was the alert, cold face of a man of about five-and-thirty. How would you explain “five-and-thirty” in the last sentence? Thanks!