A white crew-neck t-shirt and beige chinos are great menswear staples that will integrate really well within your daily styling arsenal. To give your getup a more laid-back vibe, why not introduce a pair of black athletic shoes to the mix? And if we're talking casual outfit ideas for mature men, this ensemble looks good on almost any gent.
A white crew-neck t-shirt and navy jeans are the kind of a no-brainer casual look that you need when you have no extra time to plan out an ensemble. You could perhaps get a bit experimental on the shoe front and play down this outfit by slipping into a pair of black athletic shoes. A good, less conservative outfit for a mature gentleman.