Explanation:

Correct option 4: 38 years

- Five years ago, average age of four men = 48 years

- Total age then = 48 × 4 = 192 years

- Now, each has aged 5 more years

- Added age in 5 years = 4 × 5 = 20

- Total current age = 192 + 20 = 212 years

- A fifth man joins, and the new average is (48+2) = 50 years

- Total people = 5

- Current total age should be 50 × 5 = 250 years

- Age of new man = 250 - 212 = 38 years

Answer: 38 years