Charak Samhita
आयुषःप्रमाणज्ञानहेतोःपुनरिन्द्रियेषु] जातिसूत्रीयेचलक्षणान्युपदेक्ष्यन्ते ॥१२४॥
[Knowledge of lifespan] In regard to knowledge of measure of life span, there is description of symptoms in Indriya sthana and Jatisutriya adhyaya (eighth chapter of sharira sthana).
english translation
AyuSaHpramANajJAnahetoHpunarindriyeSu] jAtisUtrIyecalakSaNAnyupadekSyante ॥124॥
hk transliteration by Sanscript