L, I, S, T, E and N, each has a different age. Only N is younger than L. S is older than T, but younger than E. Only I is older than E. Who is the third youngest?2357

The correct option is T.

Let us analyze the given information step-by-step to arrange the five individuals (L, I, S, T, and E) in order of their age, from oldest to youngest (or youngest to oldest).

Step 1: Understand the total number of people
There are 5 people in total: L, I, S, T, and E.

Step 2: Position of L and N
We are given that "Only N is younger than L."
This means L is younger than everyone else except N, which places N as the absolute youngest (5th position) and L as the second youngest (4th position).
Order from youngest to oldest so far:
1. N (Youngest / 5th)
2. L (2nd Youngest / 4th)

Step 3: Position of I and E
We are given that "Only I is older than E."
This means I is the absolute oldest (1st position), and E is the second oldest (2nd position).

Step 4: Determine the remaining position for T and S
We are given that "S is older than T, but younger than E."
So far, we have:
- 1st (Oldest): I
- 2nd: E
- 4th: L
- 5th (Youngest): N

Since S is younger than E and older than T, and we have positions 3rd, 4th, and 5th left relative to E, placing T and S gives:
- S must be older than T.
- Therefore, the complete order from oldest to youngest is:
1. I (Oldest)
2. E
3. S
4. T
5. L
6. N

Wait, let us re-verify all 5 people:
People: L, I, S, T, E (Wait, there are 6 names listed in the prompt: L, I, S, T, E and N - total 6 people!).
Let us check the order of all 6 people from youngest to oldest:
1. N (Youngest)
2. L (2nd Youngest)
3. T (3rd Youngest)
4. S (4th Youngest / 3rd Oldest)
5. E (2nd Oldest)
6. I (Oldest)

Step 5: Identify the third youngest person
Looking at the list from youngest to oldest:
- 1st Youngest: N
- 2nd Youngest: L
- 3rd Youngest: T

Thus, T is the third youngest person.