Research by the pension provider, in conjunction with YouGov, also revealed that six percent of social networkers aged 28 to 40 admit they can't live without social media sites.
Standard Life said almost all (93 percent) of this age group use Facebook, and 17 percent have between 101 and 150 friends on the social networking site.
The pension company nicknamed the group 'the Re-Run Generation', claiming many of them are so fascinated by the past that they fail to plan for the future.
Nearly half (45 percent) of web users aged between 28 and 40 said they were so fascinated with their youth because Facebook allows them to stay in touch with friends from school and university.
Social commentator Damian Barr said: "The Re-Run report shows we devote endless time, money and energy extending our youth with social media like Facebook, and yet by making the past so much a part of the present, we risk making our future riskier still. We have to start looking forward as well as back."