A camel overcoat and charcoal dress pants are a polished combo that every modern gent should have in his collection. For something more on the daring side to complement this outfit, introduce a pair of chelsea boots to the mix. If you want to project maturity as a man in his twenties, an ensemble like this is a viable option.
For an outfit that's pared-down but can be styled in a ton of different ways, make a black leather biker jacket and charcoal dress pants your outfit choice. Complete your look with a pair of chelsea boots and off you go looking smashing. This outfit proves that dressing your age and looking stylish are not mutually exclusive things for a gent in his 20s.