Starfire's age varies depending on different storylines and comic arcs. But generally, she's often depicted as being in her late teens or early twenties.
Sure, they met. Their meeting was a key moment that led to many developments in the comic series. It set the stage for their relationship and adventures together.
Dick Grayson and Starfire don't marry in the typical comic runs. Their storylines focus more on their adventures and individual character growth rather than a marital commitment.
In mainstream comics, there are no such inappropriate stories as the term 'girl penis' is biologically incorrect and not part of normal comic narratives. Starfire is a character from Teen Titans and her stories typically revolve around heroism, friendship, and adventure.