I was looking at some old photos, I discovered I forgot to list two of my foreign vacations about 7 years ago. They were not in my new passport, and it was a honest mistake for not listing them on the SF86 form. I hope it does not disqualify me from getting my security clearance.
You only need to list travel for the past seven years. If it was beyond seven, it is not required. If it is within seven, let the investigator know at the beginning of the interview. You should be fine. Be prepared to answer all the questions about the travel you would have been required to answer if you had listed the information.
I got the vacation information all type out for my interview.