Casual/Hip shirts

I’m just wondering where the more hip style of shirts fit in. The style with the collar that is softer, a couple pockets on the front a few more sewing lines and a design on the back. The bottom of the shirt looks like it’s made be be worn untucked. Are these an immature look, is it ok to wear them as a much younger man? Are they just something you would throw on with jeans? Any input would be appreciated.