Anyone taking out a sipp must be under the age of 75 and you can draw an income from your sipp at the retirement age of 50 until the age of 75; this is set to change after April 2010 when the retirement age goes up to 55.
Additionally you can start to draw an income from your sipp and still continue to work. Any pension payments you receive will be classed as part of your income and this will be included by HM Revenue and Customs when they work out your tax contributions.
If you are over the age of 75 you can only invest in a sipp if you are transferring an Alternatively Secured Pension (ASP) from a current pension provider. Using an Alternatively Secured Pension will be a form of income drawdown after the age of