Ultimately this should be their decision. For many young trans people, the physiological changes of puberty or even the idea of future reproduction can be a source of severe distress. They may not be interested in having biological children, or they may not want to undergo the physical and mental stress of fertility preservation treatments. It is important to remember that putting them under pressure will have negative consequences for their mental health, and that they will benefit most from being supported and listened to by their family and friends. If they do not want to undergo fertility preservation but still want to start a family later, you can talk to them about other options like adoption, co-parenting and surrogacy.