Money is the only thing that dictates that. If you can pay, you can play with blood boys and regular stem cells, or if CRISPR or telomer extension are possible, hiring a health nanny and maintain perfect nutrition, etc etc.

If you can pay for it, they will let you. As for transhumanism, I don't know much, I have only sat through an introductory talk, like a serman. It was super approachable, exciting, but also culty. And who knows how deep that shithole goes.