I can't hear, I can't understand

I have been wearing hearing aids for more than five years.  But as I have written before, it is not just detecting sound that I am slipping in.  It tends to be understanding more often.  I can often tell that someone spoke but I don't know what it is they said.  At times, I ask "What did you say?"  Much of the time, I understand what they are saying the 2nd time.  Sometimes, not then, either.