Brihat Parashara Hora Shastra
केन्द्रे शुभग्रहैर्युक्ते लग्नेशे च शुभान्विते । सन्दृष्टे गुरुणा वाऽपि पूर्णमायुयुस्तदा भवेत् ॥ ६०॥
If a Kendr contains a benefic, while Lagn‟s Lord is yuti with, or receives a Drishti from a benefic, or Guru in particular, the native will live a full span of life.
english translation
kendre zubhagrahairyukte lagneze ca zubhAnvite । sandRSTe guruNA vA'pi pUrNamAyuyustadA bhavet ॥ 60॥
hk transliteration by Sanscript