This casual pairing of a short sleeve shirt and brown cargo pants is a winning option when you need to look sharp but have no extra time to put together an ensemble. You could perhaps get a little creative in the footwear department and add a pair of white and black athletic shoes to this ensemble. Casual outfits for middle-aged gents aren't actually that hard, as you see.
A short sleeve shirt and white jeans? This is an easy-to-wear outfit that you could wear on a day-to-day basis. Introduce white and black athletic shoes to the equation to add a sense of stylish casualness to this outfit. And if we're talking casual outfit ideas for gentlemen in their forties, this look looks cool on most men.
Dress in a short sleeve shirt and light blue jeans for comfort dressing with a modern twist. Complement this outfit with white and black athletic shoes to make a classic outfit feel suddenly edgier. This getup suggests how to keep killing in the casual fashion department as a 40-something gent.