Brihat Parashara Hora Shastra
पञ्चत्रिंशैकचत्वारिंशद्वर्षे मरणं पितुः । पितृस्थानाधिपे सूर्ये मन्दभौमसमन्विते ॥ २१॥
One will lose his father in the 50th year, if Sūrya, being the Lord of Dharm, is conjunct Mangal and Śani.
english translation
paJcatriMzaikacatvAriMzadvarSe maraNaM pituH । pitRsthAnAdhipe sUrye mandabhaumasamanvite ॥ 21॥
hk transliteration by Sanscript