The article doesn't make it that clear but I think the rescuees were 11 at the time of the incident, which was two years ago, so they're ~13 now.

The article isn't that clear, but I think this incident happened two years ago in 2021 and the photo is recent. So the two girls in the middle were 11 at the time but are ~13 now, and the rescuers are now 19 and 20 but would've been 17 and 18 at the time.