Answer: 6 members of the family were at least 35 years old.
Step-by-step explanation:
At least are the keywords here. That means 35 and above. Two of the family members were exactly 35 years old, and 4 of the family members were above 35 years old. 2 + 4 = 6.
Therefore, exactly 6 of the family members were at least 35 years old.