Five years ago, the average age of a group of seven members was $43$ years. One member left the group just recently and the present average age of the group members became $42$ years. What is the present age (in years) of the member who left the group?

1. Five years ago:
* Total age of $7$ members $=7\times 43=301$ years.

2. Present day (5 years later):
* Since each of the $7$ members has aged by $5$ years, the total present age increases by $7\times 5=35$ years.
* Total present age of all $7$ members $=301+35=336$ years.

3. After one member leaves:
* Remaining members = $6$.
* Present average age of these $6$ members = $42$ years.
* Total present age of these $6$ members $=6\times 42=252$ years.

4. Age of the member who left:
* Present age $=336-252=84$ years.