If you don't take fashion too seriously, go for a relaxed casual ensemble in a crew-neck t-shirt and blue jeans. Dark brown casual boots are guaranteed to give a touch of class to this outfit. A good illustration for anyone who's still figuring out how to dress after 40.
Dark Brown Casual Boots with Crew-neck T-shirt Smart Casual Chill Weather Outfits For Men After 40
A crew-neck t-shirt looks especially great when matched with dark brown chinos. With shoes, you could stick to a more classic route with a pair of dark brown casual boots. This pairing is a good illustration gentlemen in their 40s can very well slay in the fashion department.