> Aka someone wants to know if i'm over 18, someone needs to verify to that entity that im over 18. > If i now trust a random company to verify me, someone now needs to trust that random company. As usual with Crypto/Bitcoin the trust anker issue is not solved as far as i know.

Chain of trust (i.e like HTTPS certs). You'll have to have trusted oracles any way for blockchains. No way around that.