You can currently expect to receive from around £164.35 a week from your State Pension. (To qualify for a full state pension, you must have 35 qualifying years of national insurance contributions.) This will provide approximately £8,546 a year from your state pension age, which has now been raised to 68 for people born after 6th April 1978.
Equating this to a 35-hour week, the state pension pays you £4.70 an hour. The current National Minimum Wage is £8.75 an hour. Relying solely on a state pension which is only about half the minimum wage does not make much sense when trying to plan for a comfortable retirement.