Ada is younger than Darwyn. Max is younger than Greta. James is older than Darwyn. Max and James are the same age. Which of the five people is the oldest?
Since Ada is younger than Darwyn, Ada cannot be the oldest.

Since Max is younger than Greta, Max cannot be the oldest.

Since James is older than Darwyn, then Darywn cannot be the oldest.

Since Max and James are the same age and Max is not the oldest, then James cannot be the oldest.

By elimination, Greta must be the oldest.

(The order of ages, from oldest to youngest, could be Greta, Max/James, Darwyn, Ada.)

ANSWER: Greta