Link below for article. A 69 year old man is starting a legal bid to become a 49 year old because he thinks he looks it and he feels it. He doesn't feel 'comfortable' with his date of birth and compares is to gender change. He describes himself as a 'young god' 
I think I might start a legal bid to identify as a 70 year old. Think of the compliments I might get!
www.theguardian.com/world/2018/nov/08/dutch-man-69-starts-legal-fight-to-identify-as-20-years-younger