Well it depends on your circumstances, how much you've saved over the years, whether you've contributed to a pension scheme.
I believe savings will affect how much state pensions you receive, but since this is government managed - you will need to speak to your local authority as it might be different based on where we are located geographically.
If you are in the UK like me, this is a site that (claims) to help you: http://www.nidirect.gov.uk/state-pension-and-pension-credit-rate-how-much-can-you-get
Otherwise I find money saving forums useful for this sort of question too