Now, before you get excited about seeing them play 80-year-olds, here's the spoiler. The makers have decided to rope in two NRIs from UK to play their older version.
The casting agents for the film were looking for a Hindi-speaking actress in the age group of 70 and 90 years, and a Hindi-speaking actor in the age bracket of 70 and 85. They requested that only candidates who look like the older versions of the two stars must apply.
For the applicants' reference, the agents even put up Kat's recent picture and another picture of Sidharth where he looks like an older version of himself.
See for yourself here:
The auditions began and ended in July.