I saw some people ask this question in other threads so I thought its best to include it here as well.
Regarding previous expired passports;
To simply answer, If the expiry date of the old passport falls within your 5 year eligibility period or if the dates between your old and new passport overlap, you should include the old passport details on the form.
If the old passport expired before your 5 year eligibility period, you need not mention the same on the form. It is entirely up to the individual if they want to provide this additional info.
I know people who did provide previous passport details outside of 5 yr period and those who didn't provide it as well, both got their application processed normally. It is your decision at the end of the day.
Regarding previous expired passports;
To simply answer, If the expiry date of the old passport falls within your 5 year eligibility period or if the dates between your old and new passport overlap, you should include the old passport details on the form.
If the old passport expired before your 5 year eligibility period, you need not mention the same on the form. It is entirely up to the individual if they want to provide this additional info.
I know people who did provide previous passport details outside of 5 yr period and those who didn't provide it as well, both got their application processed normally. It is your decision at the end of the day.