So who is the tallest?

We went to watch indoor cricket this evening. Our two older grandsons continually measure their height against mine. I am 6 foot 1 on the old scale. It is Hadley's 17th birthday today.He is on the left. I think that I just have a fraction of extra height at the moment. Then there is Cooper on the right who has just turned 13. I can imagine him shooting up past my height in a year or two.