Brihat Parashara Hora Shastra
आयुर्ज्ञानविभेदास्तु बहुभिर्बहुधोदिताः । तेषां सारांशमादाय प्र्वदामि तवाऽग्रतः ॥ ३॥
Many exponents have laid down various methods of longevity calculations. Following is the summary of such schools of thought.
english translation
AyurjJAnavibhedAstu bahubhirbahudhoditAH । teSAM sArAMzamAdAya prvadAmi tavA'grataH ॥ 3॥
hk transliteration by Sanscript