The team of scientists, using data of the Chandra and HMM-Newton telescopes, I have conducted a research about communication between activity of stars, similar to the Sun, and their age. And the activity, that is intensity of x-ray and ultra-violet radiation was studied harmful to life, by similar ours. 24 stars similar to the Sun, but at different age were investigated. It has turned out that such stars in youth are extremely active and burn out space the x-ray and ultra-violet radiation generated by a crown around, however with age they become very quickly quieter and stable unlike stars of other types which continue to generate powerful flashes and radiation.