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New research shows that people who walk more [slow / slowly] at the age of 45 may be more likely to [age / ageing] faster. Scientists said that slower walkers who are in [them / their] forties and fifties could get older [most / more] quickly than faster walkers. This ageing could be [both / same] physically and [mentally / mental] . The scientists said walking speed could help doctors understand more about the age-related health problems that people [do / have] . Doctors already knew that older people who walked slowly were more [likely / liked] to have health problems. They wanted to find out if this was the [similar / same] for younger people. Researcher Terrie Moffitt said: "Doctors know that slow walkers in their 70s and 80s tend to die sooner [that / than] fast walkers their same age."

The researchers [conduct / conducted] a study and looked at test data [off / of] 904 people. The people in the tests had [medical / medically] records of health checks from [thorough / throughout] their lives. For some participants, these records went back to when they were three years [age / old] . The researchers used data on the intelligence of the participants. They looked at [what / how] quickly people could calculate things and how good their memory [be / was] . They also did tests on the participants at different walking speeds. The scientists asked the participants to [say / talk] the alphabet while walking at a normal speed and fast speed. They [scanned / scorned] the participants' brains and found that people who walked more slowly showed less brain activity while [saying / speaking] the alphabet.