The age limit of 25 years is installed because the brain is still growing and developing up to that age. Important contra-indications as some disorders are found almost always before the age of 25 (but not always before 20). We must take this contra-indication very seriously because of the immense consequences when things go wrong. And as a young adolescent you rather not come in contact with a very high dose of psilocybin, like participants use in our Retreats.