My Dd6, just got accepted as DYS, she started reading a little after 4, and had no interest in letters before that. She did progress super fast once she started.
My DD4, just tested very high in the verbal part, reaching the 99.9% (but not >). She knew some leters earlier than her older sister, but later lost interest. She is not reading at 4.5.
The only thing I would do is to try instill a love of literature. My younger one needed those more interactive books when she was little (lift the flap, sensory, etc.). I would continue to take him to the library and let him pick whatever he wants. Most kids that do not love being read, do sit (or walk, who cares as long as they are listening), do have some books that they are drawn to.
There are different definitions of reading, some require that the child is able to read the word in an unfamiliar context. For me, I considered my dd beginning to read when she was able to decode words (CVC, CCVC, and even some like creep, zoo, etc). I considered her to be reading when she knew a good number of sight words and could decode most simple words. I guess that is formally somewhere around late 1st grade level.
