If the situation permits relaxed casual style, consider wearing a denim shirt and navy jeans. Add a pair of tobacco chelsea boots to your look to completely jazz up the look. This getup shows that dressing age-appropriately and looking fashionable are not mutually exclusive things.
You're looking at the undeniable proof that a denim shirt and beige wool dress pants look awesome when paired together in a polished look for today's man. Complement this getup with a pair of tobacco chelsea boots and you're all set looking spectacular. This combo proves that dressing well as a gent in his forties is not particularly hard.