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Scientists in Germany have [cast / fast] doubt on a previously believed assumption that the processing [speedy / speed] of our brain starts to decline from the age of 20. Until now, it has been [thinking / thought] that our cognition level peaks when we are 20 and [declines / reclines] thereafter. Lead researcher doctor Mischa von Krause, of Heidelberg University, [offered / remitted] hope to older people who worry about [increasing / upping] forgetfulness or reduced brain power. He said cognitive [skill / skills] were still powerful at the age of 60 and do not [diminish / dimming] before then. He wrote: "Our finding is encouraging, as our results show that average levels in mental speed in contexts [demand / demanding] fast and forced decisions do not decline until relatively [late / lately] in the lifespan."

The study was based [in / on] data from over 1.1 million people, aged between 10 and 80 years old. The results show that our [mentally / mental] processing speed remains [relatively / relative] constant until the age of 60, but does start to decline from our [seventh / seventy] decade. The researchers said people's mental processing speed actually increases [on / in] their 20s and remains [height / high] until 60. Dr von Krause said: "Until older adulthood, the speed of information processing [on / in] the task we studied barely changed." He added that older people [do / that] take longer to make decisions, but said this was because we become more [caution / cautious] , and less impulsive and reckless as we age. The study could [fast / cast] light on neurodegenerative diseases such as Alzheimer's.