Should pensioners submit a tax teturn?

My parents are 84 and 78 respectively. They receive a monthly pension income of R140 000 /a and a contribute to a medical aid of R 22 500 /a. They dont have They have limited medical expenses not covered by the medical aid. Do they need to submit a tax return?

In theory yes, everyone should submit a tax return to make sure they are up to date with SARS.