HiCustomer Thank you for asking your question on JustAnswer. By the way, it would help us to know:
-What is your age?
-How long ago did you lose touch with them?
-Do you know the last place that they lived or the last phone number.
-How old would they be today?
-Could you explain your situation a little more?Thank you again for trusting us with your problem. Please reply as soon as possible so that we can finish answering your question.
Few more question:
Did you check the address that you have for this friend?
Is so, were they still living there?
Is this a male or female?
yes , no, female
It's more than likely she has gotten married or her name has changed, either you can find someone that may know if she has gotten married or has had a name change in all of these years. If her name has changed and she has moved away it's almost impossible to find her unless you have her married name but if you are willing to pay to find her through a private investigator, there is also a website that can help you search for her but it's going to be really hard if she has changed her name.
It's really hard to find someone especially a woman after 40 years because their names can change and they could also have passed away. Usually a classmate will know her whereabouts if they were close friends but other than that it wil be very hard to find them after 40 years. Would like to ask another expert? Please let me know what you would like to do.
Below is several sites I found that may be able to help you with that: