Can you explain if it's possible to get a growth spurt after 19?

Unlikely to happen: Growing bones have plates for new growth located just before the bone ends. These growth plates have less density than bone ; show up on xray as a dark line like a crack. As long is there are open growth plates, there is potential for more growth in that bone. A hand xray is often studied in kids to see if they have more time to grow. At 19 most growth plates are closed so growth is done.