The average age of a five-member family 10 years ago was 25 years. Meanwhile 2 children were born. At present the number of members in this family is 7 and if the average age of the family is 27 years. It is known that if the older child is 4 years older than the younger child, then what will be the age of the older child?

• A. 18 years
• B. 7 years
• C. 9 years
• D. Cannot be determined