After your father goes to the forest and awards you the rule of his kingdom, you will rule continuously the entire world for thirty-six thousand years, and all your senses will continue to be as strong as they are now. You will never become old.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
प्रस्थिते तु वनं पित्रा दत्त्वा गां धर्मसंश्रयः । षट्त्रिंशद्वर्षसाहस्रं रक्षिताव्याहतेन्द्रियः
prasthite tu vanaṃ pitrā dattvā gāṃ dharmasaṃśrayaḥ | ṣaṭtriṃśadvarṣasāhasraṃ rakṣitāvyāhatendriyaḥ
SB 4.9.22