It can be both- a lack of maturity or an LD. Two of my children are bright, they were both late readers- no phonemic awareness skills- I could see it early, because I was educated on it. The teachers said it was all maturity issues. If you suspect, don't waste anytime because intervention is best done in the very early years. The older they get the harder it is. My dd (13) now is a fabulous reader- and loves the classics. We have had to modify some and do intensive writing & spelling, but she is gifted in so many other areas.:o