2003 Acura RSX change brake fluid

I was told that my brake fluid is dark, and needs changing. I was searching online and know that involves bleeding the brake. What if I just replace the brake fluid in the brake fluid reservoir, without bleeding the brakes? Would it extend the life of the brake fluid. I understand it will not completely replace the brake fluid. I was thinking that the new brake fluid will eventually get to the brake, together with the old fluid. This would dilute it into not so old fluid. Thanks.