If the setting permits casual dressing, choose a navy and white polo and navy jeans. Navy suede loafers will polish off any getup. This combo is most probably exactly what you're looking for as a middle-aged guy.
Navy and White Polo with Navy Jeans Outfits For Men After 50
You'll be surprised at how super easy it is for any gent to get dressed this way. Just a navy and white polo married with navy jeans. A great pair of brown leather tassel loafers is an effortless way to inject an added touch of polish into this outfit. Wondering how to nail casual style as you pass the big 5-0? This combination is a vivid example.