Divide the total by the number of friends (3), this will give you the middle year.
6039 / 3 = 2013
Now subtract 1 from that for the earliest year:
2013 -1 = 2012
Add 1 to the middle year for the latest year:
2013 +1 = 2014
The youngest person would be the one born in the latest year, which would be 2014.
