If you are turning 70 1/2 in 2014 a REQUIRED MINIMUM DISTRIBUTION (RMD) is necessary from your retirement accounts. You can either withdraw the 2014 distribution by 12.31.14, OR you can defer for three months to 04.01.15.
The option to defer is permitted only for 2014, the first year of RMD. Thereafter, you will need to take the RMD by Dec 31st each year.
To further clarify (or confuse), if you turned 70 1/2 in 2013 or prior years, you must withdraw 2014 RMD by 12.31.14 even if you deferred 2013 RMD until 04.01.14.