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: Click to print (Opens in new window) Print Click to share on Facebook (Opens in new window) Facebook Click to share on Pinterest (Opens in new window) Pinterest Click to share on Pocket (Opens in new window) Pocket Click to share on Reddit (Opens in new window) Reddit Click to share on X (Opens in new window) X Click to share on WhatsApp (Opens in new window) WhatsApp Click to share on LinkedIn (Opens in new window) LinkedIn Click to share on Tumblr (Opens in new window) Tumblr Click to share on Telegram (Opens in new window) Telegram