Mun Sen underwent a long period of illness after suffering a stroke during a trip to Malacca. He experienced financial hardship in the closing years of his life. He pawned his Leica camera for $5.00.
 

1972. Pameran Peringatan Yong Mun Sen/ Yong Mun Sen Memorial Exhibition. Exhibition catalogue 17 March - 4 April. Kuala Lumpur: Balai Seni Lukis Negara/National Art Gallery; (Tan, 1992(c): 30)