The speaker sounds like he is pronouncing the 't' in 'ecart', which should be silent. It almost sounds as if he is saying: "Ils ont cinq ans d'equatre".
When I listened to the word "ecart" in the Collins online dictionary it had the correct pronunciation with the 't' being silent.
Otherwise, I enjoyed this exercise and learned a new word: "ecart". And, now, I don't think I will easily forget it either!