How to wear hairpiece as handsome man at40?

Several options. Your BEST option is to shave your head, trim yourself by eating wisely and getting physically / aerobically fit, and put on some muscle by doing resistance training. NOTHING looks better than a man who embraces what Nature gave him and pursues health while other men are getting flabby. Your other options include medical or surgical baldness treatments, or any of a variety of hair pieces.