Try teaming a polo with navy shorts if you seek to look casually cool without too much effort. Complete this outfit with white and black leather boat shoes and off you go looking boss. Casual looks for stylish 30-something Millennial gents aren't actually that hard, as you see.
A polo and navy shorts are a cool combo worth integrating into your daily casual rotation. On the shoe front, go for something on the casual end of the spectrum and complete this look with grey athletic shoes. This combo demonstrates that after 30 your outfit options are in no way limited.