How to calculate the reincarnation age of a living Buddha?

In fact, the age of reincarnation of a living Buddha is not a very important condition. So generally speaking, in terms of age, as long as the child was born one or two years after the death of the last generation of living buddhas, it is ok, but the difference is not too much. The most important condition for choosing children is their spirituality. The search for children will begin in secret after the funeral affairs of the last generation of living buddhas have been handled. Generally, it is necessary to wait until the child is 3 or 5 years old to determine the candidate to be selected, so that the child's spirituality can be directly examined and the child's innate IQ can be prevented.