The Talmud recommends that a man marry at age 18 “Shemoneh Esrei L’Chuppah”. That may possibly be a bit early in today’s days, but I believe that most bochurim are mature enough at 21 and should definitely start dating. My parents were holocaust survivors and pressured me to marry young even though my Rosh Hayeshivas were not exactly excited about it. I’m still thankful to them for that, several decades later. All Yiddish children should IY”H find their basherta in the right time and quickly.