ISO Brother - Caucasian Male Born in 1966 Chicago

I am a 45 year old caucasion male adoptee who was born in Cook County Chicago on June 18, 1967. I recently located my birth mother, who told me that I have an older brother who was also put up for adoption. He is approximately 1 year older than me, which would put his birthday some time between January and September 1966. But this is only an approximation. Unfortunately, our birth mother does not recall the exact date, only that we were born approximately 1 year apart. We share the same mother and father, so we are true100% biological siblings. This news is pretty amazing and I am desperate to find my long lost brother. Unfortunately, we have no other leads other than the approximate date and city of birth. Hoping that my brother knows that he is adopted and is searching these forums for a connection!