I've have read some published papers which related to psychological interventions in health care settings. I want to exclude the papers that include participants aged over 65, but many of the papers only tell me that participants were aged "18+". Is there a way to calculate the actual age range of participants in the sample? The papers generally include sample size, mean age and standard deviation.

To try and solve this problem, I have asked a supervisor who told me to "Google it". I googled it but didn't find how how to solve this. I have also tried to contact our stats dept but it's closed for Easter and I really need to work this out as soon as possible. If anyone can advise me, I would be most grateful.

Thank you in advance.