Once you are 60, if you are single you are guaranteed an income of about �124 per week. This can be made up of your normal state pension, any occupational pension and any other income. If the amount you get from all these sources is less than the �124, then you can get Pension Credit to top it up to that amount. If you have a partner the figure is higher, & all the income of both of you is taken into account.
So far as savings are concerned, there is no upper limit but you are assumed to get income of �1 per week from each �500 of savings in excess of �6000. If you use savings to pay off debts (but they must be genuine ones) this is not treated as deprivation of capital in the same way as it could be if you are under 60.
The above is an outline. It can get a bit complex. It would be a good idea for you to go to the local CAB or other welfare benefits advice centre to go over your circumstances in some detail. Alternatively, ask the DWP how arrangements are made for you to stop income support and claim pension credit.