Go for dapper style in a grey knit blazer and a white long sleeve shirt. This pairing proves that figuring out how to dress stylishly at 30 is not particularly hard.
White Long Sleeve Shirt with Grey Knit Blazer Outfits For Men In Their 30s
As you can see, looking casually classic doesn't take that much time. Wear a grey knit blazer with a white long sleeve shirt and be sure you'll look incredibly stylish. This combo is probably exactly what you've been looking for as a 30-something Millennial gentleman.
This look with a grey knit blazer and a white long sleeve shirt isn't hard to pull together and is open to more sartorial experimentation. Rock a pair of black leather loafers to change things up a bit. If you're over 30, take inspiration from getups like this to take a more serious direction in your personal style.