The average age of a man and his wife at the time of their marriage was 27…

We are told that the average age of the man and his wife at the time of marriage is 27 years.

So, their total age at the time of marriage = 27 × 2 = 54 years.

After 4 years, each of them is 4 years older, so their combined age increases by 4 + 4 = 8 years.

Total age of the man and his wife after 4 years = 54 + 8 = 62 years.

After 4 years, they have a 1-year-old child, so the child's age is 1 year.

Total age of the family now = 62 + 1 = 63 years.

Number of family members = 3 (man, wife, and child).

Average age of the family = total age ÷ number of members = 63 ÷ 3 = 21 years.

Therefore, the average age of the family now is 21 years.