Go all out in a dark green blazer and a light blue dress shirt. Balance out your look with a more laid-back kind of shoes, like this pair of brown suede desert boots. As you can see here this combination is something you can totally wear as a middle-aged gent.
One of the most elegant ways to style out such a timeless menswear piece as a dark green blazer is to marry it with a light blue dress shirt. If you're puzzled as to how to finish off, complement this look with a pair of dark brown suede derby shoes. Outfits like this have a sophisticated air that befit over-40 guys really well.