Christopher Marlborough-Jones is wanted by Kent Police in 'connection with the breach of a restraining order'.
The police force said he has been 'added to our most wanted gallery'.
He is from the Canterbury area but could be in Sussex.
Sharing the appeal on social media, Sussex Police wrote: "Can you help our colleagues in Kent?
"Christopher Marlborough-Jones is wanted in Canterbury but is known to visit Sussex, with links to Brighton and St Leonards."
If you know where he is, call the police on 101, quoting reference 46/173910/21.
You can also call the independent charity Crimestoppers anonymously on 0800 555111 or complete the online form.