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Old age is often blamed for causing us to misplace car keys, forget a word or lose our train of thought.
But new research shows that many well-known effects of ageing may start decades before our twilight years.
According to scientists, our mental abilities begin to decline from the age of 27 after reaching a peak at 22.
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It's widely accepted that friendships are invaluable to the soul but few of us were aware that they could also boost the bank account.
A study of 10,000 US students over a period of 35 years suggests the wealthiest people are those that had the most friends at school. Each extra schoolfriend added 2% to the salary.
The researchers said this was because the workplace is a social setting and those with the best social skills prosper in management and teamwork.If a wide circle of friends is taken as a popularity indicator, does that mean the more you have the more successful and happy you are? Or can you have too many? What is the best number?
The average number is about 150, says leading anthropologist Robin Dunbar.
Daylight saving time, which began this week in most of the United States, has long been promoted as a way to save energy. Whether it does is still a matter of debate. But it does seem clear from studies that a one-hour time adjustment can have unintended health consequences.
It seems that when the clock is moved forward or back one hour, the body’s internal clock — its circadian rhythm, which uses daylight to stay in tune with its environment — does not adjust. In a study of 55,000 people, for example, scientists found that on days off from work, subjects tended to sleep on standard time, not daylight time: their waking hour followed the seasonal progression of dawn.