Not all stars were created at the same time, but there was an increase in training processes in a given time period. Now, Scottish and American experts estimate that the peak of activity occurred 5,000 million years ago, before what they thought.
To do this, they have analysed the light spectrum of almost 100,000 stars and calculated when each of them emerged. However, it is still expected to improve the spectra analysis techniques to obtain a more accurate model of calculation.