The State Pension changed on 6 April 2016 for people who reach State Pension age on or after that date. This is men born on or after 6 April 1951 and women born on or after 6 April 1953. The old rules (which include basic State Pension and Additional State Pension) were complicated, making it difficult to know how much you'd get until you were close to State Pension age. Not everyone will get the full new State Pension though, as it will depend on your National Insurance record.
If you have questions relating to State pensions visit the yourpension.gov website.
You can find out your State Pension Age using the State Pension Age calculator.