"If one or both was under 18 when they first met" The age of 18 relates to the age of consent for step- relationships. The age of consent in the UK for most r

"If one or both was under 18 when they first met" The age of 18 relates to the age of consent for step- relationships. The age of consent in the UK for most relationships is 16. It's raised to 18 in the case of many step- relationships. The age at which they met is irrelevant; the age at the moment of the activity – marriage/sexual congress – is the relevant matter in law. Once both parties are older than 18 there is no legal impediment.