Showcase that nobody does semi-casual menswear like you by wearing a shawl cardigan and a navy and white long sleeve shirt. A pair of beige suede casual boots integrates wonderfully within a ton of combos. Nice but also age-appropriate, an ensemble like this will help upstage any of your peers.
For an outfit that's street-style-worthy and casually neat, rock a shawl cardigan with a navy and white long sleeve shirt. Dark brown suede desert boots will be a welcome complement for this look. This pairing is your answer to the question of how to dress age-appropriately as you step into your 40s.