Brihat Parashara Hora Shastra
एवं बहुविधा विद्वन्नायुर्योगाः प्रकीर्तिताः । एषु यो बलवांस्तस्याऽनुसारादायुरादिशेत् ॥ ७॥
Like these, there are many other Yogas, dealing with the issue of longevity. The strength and weakness of the Grahas concerned be estimated in deciding longevity.
english translation
evaM bahuvidhA vidvannAyuryogAH prakIrtitAH । eSu yo balavAMstasyA'nusArAdAyurAdizet ॥ 7॥
hk transliteration by Sanscript