Joseph, you have also failed to answer my question to name a single American Litvish Rav who is on the record supporting boys dating at 18. I’ll also point out that I asked you first. Saying that “its a Chazal so surely they support it for this generation too” isn’t a legitimate answer. Rabbonim oversaw the creation of the current Yeshiva system, are you implying they forgot/ignored this Chazal?
Please answer this, and not with a simple yes or no: Regardless if it’s right or wrong, do you believe that 12th grade yeshiva boys in 2019 are fully prepared for marriage?