M, A, T, H and S, each have different ages and all ages are integers. M is younger than only two persons. H is 88 years old, which is the second highest age. S is younger than M but older than A. Who is the eldest?

The correct option is T.

Let us determine the age order of the five individuals (M, A, T, H, and S) step-by-step from eldest to youngest based on the given clues:

1. Determine M's position: We are told that "M is younger than only two persons." This means there are exactly two people who are older than M. Therefore, M must be the third oldest person in the group.
Current rank order: 1st (Eldest) > 2nd > M (3rd) > 4th > 5th (Youngest)

2. Determine H's position: We are given that "H is 88 years old, which is the second highest age." This places H as the second oldest person (2nd rank) in the group.
Current rank order: 1st (Eldest) > H (2nd) > M (3rd) > 4th > 5th (Youngest)

3. Determine the positions of S and A: We are given that "S is younger than M but older than A." Since M is in the third position, the remaining positions below M (the 4th and 5th positions) must be filled by S and A, respectively.

$M>S>A$

This means S is the 4th oldest and A is the 5th oldest (youngest).
Current rank order: 1st (Eldest) > H (2nd) > M (3rd) > S (4th) > A (5th)

4. Find the eldest person: The only person remaining to be placed is T. Since the eldest (1st) position is the only one unoccupied, T must be the eldest.
Final age order: T > H > M > S > A

Therefore, T is the eldest person in the group.