No, but my horizontal measurements have definitely gone up since then.
Ackshually, different physical skills tend to have different age peaks - pure speed and reaction time in early 20's, strength rather later, and endurance running as "late" as the early 30's or more. By way of example, Usain Bolt's 100m world record was set when he was not quite 23, and Kipchoge set the current marathon record at age 31.
But the point stands - both Zion and RJ could still be getting faster, higher, stronger at age 19.