Median: 50
1) Let's write it orderly from the least to greatest to calculate the median:
13, 18, 19, 47, 50, 50, 69, 73, 77, 78, 86, 97
2) As we have 12 ages an even number, then the median is going to be found by the average between the 6th and 7th age
13, 18, 19, 47, 50, 50, 69, 73, 77, 78, 86, 97
3) Hence, the Median of these 12 ages is 50 years old.