If you dream of yourself being old and frail, it means you are being incapacitated in your present situation. Your dream imagery is a metaphor of your current situation. Since the imagery shows an old person who has become less able bodied because of age, the message is about being handicapped.
The dream of yourself being old, may also be a prediction of your old age. If you have been experiencing medical problems because of poor health, this is a wake up call for you to take care of your health.