Brihat Parashara Hora Shastra
भाग्याज्जामित्रगे शुक्रे तद्द्यूने दारनायके । त्रिंशे वा सप्तविंशाब्दे विवाहं लभते नरः ॥ ३४॥
The native will marry at 30, or 27, if Śukr is in Lagn, while the 7th Lord is in Yuvati itself.
english translation
bhAgyAjjAmitrage zukre taddyUne dAranAyake । triMze vA saptaviMzAbde vivAhaM labhate naraH ॥ 34॥
hk transliteration by Sanscript