In the UK there is no law stating it is illegal for a 23 year old to date a 17 year old. As you are 17 and a young adult, you are old enough to decide if you want to be in a relationship with this man. Its important that both partners consent to the relationship, and that they trust and respect one another.

Can a 16 year old date a 26 year old UK?

The age of consent in the UK is 16. This means that its against the law for someone to have sex with someone under the age of 16. It wouldnt be illegal for someone whos 16 to have a relationship with someone who is 30 - unless that person is their teacher or in a position of authority.