fillivey wrote:
so clearly something changed about when he was 18 and he got more serious.
Even if you hit puberty late, you’re unlikely to grow significantly after the ages of 18 to 20Trusted Source. Most boys reach their peak height around the age of 16. However, men still develop in other ways well into their twenties.
https://www.healthline.com/health/do-guys-keep-growing-until-age-25