Alter Ego: Richard (Dick) John Grayson
Occupation: Crime Fighter
Marital Status: Single
Known Relatives: John Grayson (father, deceased), Mary Loyd Grayson (mother, deceased); Bruce Wayne (adoptive father), Jason Todd (adoptive brother)
Group Affiliations: Batman Family, Titans
Base of Operations: Gotham City
Height: 5ft 10in"
Weight: 175 lbs.
Eyes: Blue
Hair: Black
First Appearance: DETECTIVE COMICS #29 (July, 1939) Created By: Bob Kane, Bill Finger, Jerry Robinson

The transition from Golden Age to Siver Age (later designated Earth-2 and Earth-1) versions was unintentional, and had no clear splitting point. Robin's early history was much more consistant between versions, but in some cases, character traits and continuity events that would later be ascribed specifically to different versions of Robin had actually been associated with a single Robin in a past story. Once the Earth 2 & 1 concept had been developed, the Earth-2 Robin was linked with the original appearance date while the Earth-1 Robin was kept roughly static by floating his past history. So, whenever the Earth-1 continuity comic book was published, Robin was born about 13-18 years before, and commenced his career at at around 13. Later Earth-1 stories gradually let Dick Grayson age from a child to a young adult, first as a more mature Robin, then as Nightwing he must've aged to his early 20s.

[This Dick Grayson's early history was almost identical to that of the Earth-2 Dick Grayson.]
When Dick went off to college, he began to act as Robin more independantly from Batman. In time, he became affiliated with a group of young heroes called the Teen Titans (later just the Titans). He eventually left school (much to Bruce Wayne's consternation) and adopted the costumed identity of Nightwing, which was almost a cross between the Batman and Robin costumes.