http://5dfcmsgsfemr4n4oea7nryhfc67xcnf7bk6wjvw7q2h4zmcakspby2id.onion/faq_redditulpas.html
Again, it's your mind - make the best judgment call you can. Q: I'm (insert age here), should I make a tulpa? A: You are able to make a tulpa at any age, but you should, regardless of age, realize that this is going to be a very, very long commitment, and should not be treated as a phase or a fascination you can just set aside.