Finding a specific index while labeling it with another

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.

[Stephen23]

M = [1, 2, 3, 4, 5; 12, 46, 84, 8, 23]

M = 2×5

1 2 3 4 5 12 46 84 8 23

[~,X] = min(M(2,:));
P = M(1,X)

P = 4

Answer 1

[KALYAN ACHARJYA]

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