Putting together a grey wool blazer with a navy crew-neck sweater is a nice idea for a casually elegant look. Dark brown leather loafers are an effective way to upgrade this ensemble. So if you're after a nice and age-appropriate pairing, this one fits the bill.
As you can see here, looking casually sleek doesn't take that much time. Just pair a grey wool blazer with a navy crew-neck sweater and be sure you'll look amazing. Make tan athletic shoes your footwear choice to make an all-too-safe getup feel suddenly edgier. This combo proves that figuring out how to dress well as you go into your 40s is not that hard.