Brihat Parashara Hora Shastra
अनायुश्चेद् भवेदल्पमल्पान्मध्यं प्रजायते । मध्यमाज्जायते दीर्घं दीर्घायुश्चेत्ततोऽधिकम् ॥ ४९॥
Increase and Fall in Class of Longevity. From very short life to short life, from short life to medium life, from medium life to long life and from long life to extremely long life are the increases in the classification of longevity, when Guru warrants an increase.
english translation
anAyuzced bhavedalpamalpAnmadhyaM prajAyate । madhyamAjjAyate dIrghaM dIrghAyuzcettato'dhikam ॥ 49॥
hk transliteration by Sanscript