Profiles will appear "private" if you follow do this:
1) enter a birth date (1913 or forward) and no death date.
2) make sure the radio button "living" is chosen. Go to the profile and *edit this person* to view whether the system has defaulted to the correct status, living or deceased.
If you don't trust the system (there are reasons not to), don't add the living to your tree, or make their profiles generic. Use "living" in both the given and surname fields. Don't add any other specific data other than gender. This gives you a head count of the household only.