It has been noted that boys tend to be twice their height at 24 months of age when they reach adulthood. Predicting Your Adult Height Share this: Print (Opens in new window) Print Share on Facebook (Opens in new window) Facebook Share on Pinterest (Opens in new window) Pinterest Share on Reddit (Opens in new window) Reddit Share on X (Opens in new window) X Share on WhatsApp (Opens in new window) WhatsApp Share on LinkedIn (Opens in new window) LinkedIn Share on Tumblr (Opens in new window) Tumblr Share on Telegram (Opens in new window) Telegram