Riddle: David is 5 years old. Fred is 4 years old. Alina is also
5 years old. Daniel is 6 years old. Valentina is 9. How old is Ronnie?
Answer: Ronnie is 6 because each person's age is the same as the number of letters in their name.
Source: https://www.riddles.com/7921
Ages of Names by Daniel Swetman Riddle