Brihat Parashara Hora Shastra
दारांशकगते लग्ननाथे दारेश्वरे व्यये । त्रयोविंशे च षड्विंशे विवाहं लभते नरः ॥ ३१॥
Should Yuvati Lord be in Vyaya, while the natal Lord is in Yuvati in Navamsa, marriage will be in 23rd/26th year of age.
english translation
dArAMzakagate lagnanAthe dArezvare vyaye । trayoviMze ca SaDviMze vivAhaM labhate naraH ॥ 31॥
hk transliteration by Sanscript