The main reason is to support each other and constant communication. According to statistics Denmark, the identical twins live longer than the average person, and much less likely to die in the middle and young age.
Identical twins the protective power lasts up to 60 years. If to speak in figures, the life expectancy of the twins is above average in Denmark 10%.
Scientists believe that the influence and material assistance, and emotional support. Among identical twins there is a strong psychological connection. This is indicated by many researchers.
The effect is similar to that described above, strong characteristic of couples living together for a long time. Strong social ties, apparently, extremely important for the individual and affect his health.