Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 2 · Signs, Planets, Birth
जातकम् १
लग्नाधिपे बलयुतशीत्यब्दं त्वायुरीरितम् ।सवीर्ये सत्सु केंद्रेषु त्रिंशच्छुद्धियुतेऽष्टमे ॥ ११४ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 55, verse 114.
With the lagna (rising sign) lord also strong, the life is said to be eighty years. Strong good planets may be in the corner houses, with the 8th clear. (Our text is unclear here: how the word 'thirty' fits this line.)
Simple meaning: Strong lagna lord with good planets well placed gives eighty years of life.
लयेशे धर्मगेजीवेष्टस्थे क्रूरेक्षिते जिताः ।
The lagna lord and 8th lord together in the 8th may shorten life to 27 years.
लग्नेऽशुभेज्यौ ग्लौदृष्टौ मृत्यौ कश्चन चाकृतिः ।
Some placements may shorten life to 22 years, others give long life.
शताब्दं गीष्पतौ कर्के कंटकस्थसितेज्ययोः ।
Jupiter in Cancer with these placements gives forty years. Another rule gives a hundred.