Shaylee, almost all dogs senses of hearing and sight decline as they age, its not a breed thing. There is a german shepherd a block away from us who is in attack mode until we are close enough for her to recognize us. She's jumped on me growling before realizing who I am. She would be dangerous to a strange person walking down the street but it is because she can't see so well. My rb dog Pepper was deaf and if you startle her she would snap on occasion.
I personally fear all the loose, overbred, vicious labs in the neighborhood over any pittie I see. I've been bitten by too many labs for comfort and would love to see some bsl against labs. I'd like to see breeding of labs more controlled and owners more controlled. Most owners around here let their labs outside with no leashes and no supervision. I find most are dangerous because they are so unpredictable.