Go for a straightforward but at the same time laid-back and cool option by opting for a v-neck t-shirt and navy shorts. If you wish to easily dress down this getup with one single piece, introduce a pair of sandals to your look. It is indeed possible to look light and breezy under the scorching heat, and this ensemble is a striking illustration of just that This combo should clear any doubts you had about dressing casually as a 50-year-old guy.