MATLAB: Finding a specific index while labeling it with another

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If I have to find which person has the youngest age by labeling which person they are, how would I do that?
The array looks like this: AgeArray=[person;age] —> AgeArray=[1, 2, 3, 4, 5; 12, 46, 84, 8, 23]
The left side is person 1, person 2, person 3, and so on, and the right side is the age, person 1 is 12 years old, person 2 is 46 years old, etc.
If I used the min(age) that will yield 8, which is person 4, but I am looking for the function to have the answer come back as person 4.
Thank you and sorry if it is confusing.

Best Answer

AgeArray=[1, 2, 3, 4, 5; 12, 46, 84, 8, 23]
per=AgeArray(1,:);
min_per=per(min(AgeArray(2,:))==AgeArray(2,:))
Result:
min_per =
     4
Considering AgeArray as the following format 
AgeArray =
     1     2     3     4     5
    12    46    84     8    23
If the Given data in this format
AgeArray =
     1    12
     2    46
     3    84
     4     8
     5    23
Then 
per=AgeArray(:,1);
min_per=per(min(AgeArray(:,2))==AgeArray(:,2))
Result:
min_per =
     4
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