They are the sons of Prince Charles and Lady Diana Spencer (Princess Diana). Their legal names are William Arthur Philip Louis and Henry Charles Albert David. Prince William was born on June 21, 1982...
No, Prince William and Prince Henry (known as Prince Harry) are not twins. Prince William is the elder son of Lady Diana Spencer and Prince Charles.
She was 19 when she got married, and got pregnant directly after the wedding. She was either 19 or 20 years old i think.
Prince William is 29 years old (birthdate: June 21, 1982).
He was 28.