Their findings show that the brain starts to decline after the 20s, and during the 40s, people start to notice change in how they remember new information. This is due to the aging of the brain having lower blood flow. This blood flow causes decrease of the efficiency of the mind." As the brain changes, so does behavior." A lot of this is due to the inability to make new long term memories.
After running series of tests, scientists felt that this decline of efficiency also affects the flashbulb memories. Of course a lot of booster methods such as brain games and classes that introduce such manner can best give improvement of retaining information. However, those flashbulb memories are forever scarred for the accuracy diminished during the aging process.