I hope this applies to middle distance runners. My cousin is ranked 13th in the UK at 1500m running as an U20. I like the idea of flying to RIO in 4 years to cheer her on.No one can predict improvement rates in sprinters but he would need to go at least 2 tenths faster to medal at the worlds or Olympics in ideal conditions. He could do it but impossible to predict if any athlete can take those last times off. Harry AA took the same title but he won't ever get anywhere near a major final one suspects. He is faster than the Jamaican Blake was at the same age and he will probably be favourite in London for the 100 m if Bolts hamstring carries on playing up.