Why not go for a beige crew-neck sweater and khaki plaid chinos? As well as very functional, both pieces look awesome when matched together. Complement your outfit with a pair of black canvas low top sneakers and ta-da: this look is complete. A good, less conservative getup for a 30-something man.
If you gravitate towards laid-back getups, why not try this combination of a beige crew-neck sweater and grey check chinos? As for shoes, introduce black canvas low top sneakers to this outfit. If you're not sure how to dress age-appropriately but also look stylish, this combo is a tested option.
For something on the relaxed end, you can dress in a beige crew-neck sweater and black chinos. To give your ensemble a more laid-back vibe, complete your ensemble with black canvas low top sneakers. This getup shows that after 30 your style options are far from limited.