yes I did ask them their Prolific ID. In fact it was the first question we ask them to enter, and it is used to match participants.
While matching the IDs, I found that their answers to age and gender question did not match with their Prolific data (the age differences were quite large to be neglected). That’s why I feel puzzling and would like to ask whether it would be appropriate to ask them about the mismatch (since it might be personal and complicated).
Thank you very much for your thorough explanation and advice! Have a great day!