What Peptides does it make no sense to use at a young age?

Hello! I would like to open a debate on which Peptides do not make sense to use under 30 years old, to give an example, Mitochondrial peptides such as Mots-C, Epitalon, GHK-cu (many people say that they have done well being young but it does not make much theoretical sense because of collagen)

Please leave your experiences both in the mentioned Peptides and in others.