Well, he doesn't have an extravagant retirement and many probably are surprised with his announcement. He can enjoy his life with his family.
That's what retirement is for or he can pursue other things and continue his love and passion for the ball.
It's just sad that D. Rose will be added to the list of all-star players and MVPs out there that never won a title in their whole NBA career. If only... if only he didn't get injured, it might've been a different career for how and with his age, I believe that he can still play at least a year or two. Anyway, like the late "Black Mamba" said, people retire because they want to pursue new things, and this might be the case for Rose. He will find a new passion or at least a new way to earn money. Who knows, there might be a college team out there that might hire him on a coaching staff.
Whatever the case is, it's a great thing for me that I watched him played during his prime. During his prime where he's just dunking and making big plays over big plays. I will not forget him because of his buzzer beater in Game 3 against the Cavaliers in a playoff series.