Brihat Parashara Hora Shastra
लग्नात् केन्द्रगते शुक्रे तस्मात् कामगते शनौ । द्वादशैकोनविंशे च विवाहः प्रायशो भवेत् ॥ २६॥
The native will marry at 12, or l9, if Śukr is in an angle from the Lagna, while Śani is in Yuvati counted from Śukr.
english translation
lagnAt kendragate zukre tasmAt kAmagate zanau । dvAdazaikonaviMze ca vivAhaH prAyazo bhavet ॥ 26॥
hk transliteration by Sanscript