Getting max element from a repeat section

Hello, I have a repeat section where I ask about the age of household members, then I would like to ask a follow-up question to the oldest member in the household only. Is this possible please?

Thank you

Take a closer look at the max() function, as this is what it is for. For an example of how to use it in relation to a repeat group, take a look at this example; substitute max() for sum(), but its the same principle.