Ok, you are over 40, a man, and wanna wear sunglasses. Actually, those sunglasses which are supposed to be fine with younsters are generally not suitable for you. Therefore, you have to choose those that are not vivid-colored, or not so fashionable, perhaps a pair of classic sunglasses will make you more charming, don't you think so? Think about Brad Pitt and Jude Law, they could be your good examples. Most importantly, you gotta go to stores and find out your favorite one.
The sunglasses with good brand will be proved at both the fashionable style and the high quality. But the price is relatively high which you should take into consideration. If you want to buy one cheap, you can go to the online store to have a look. There are many types of sunglasses with different material, colors, styles, prices and so on.