A white crew-neck t-shirt and navy chinos are essential in any gent's functional off-duty sartorial collection. Light blue low top sneakers will tie your whole getup together. If you often wonder how to dress age-appropriately, this outfit is a tested option.
A white crew-neck t-shirt and dark green chinos make for the ultimate casual outfit for any modern guy. As for shoes, introduce a pair of light blue low top sneakers to the mix. This getup should clear any doubts you had about wearing casual clothes in your 30s.