This is the Gemora – Sotah 44a:
תנו רבנן אשר בנה אשר נטע אשר ארש לימדה תורה דרך ארץ שיבנה אדם בית ויטע כרם ואח”כ ישא אשה ואף שלמה אמר בחכמתו הכן בחוץ מלאכתך ועתדה בשדה לך אחר ובנית ביתך הכן בחוץ מלאכתך זה בית ועתדה בשדה לך זה כרם אחר ובנית ביתך זו אשה
Sounds quite clear that marriage is appropriate when there is readiness. We can divert this thread into a debate about kollel, which is clear violation of this gemora. The legend is that Rav Aharon Kotler ZT”L was confronted with this as he was establishing the kollel system in America, and his response was that his project was a הוראת שעה. This was interpreted as his saying that it was necessary to plant Torah in America. One may question whether that הוראת שעה was intended to be extended 70 years later. But let us not digress. Marriage requires readiness, and the date on one’s birth certificate is not the most accurate method to assess that.