If your added years contract was written to age 60, then your added years contributions will cease at age 60; if it was written to age 65, you can continue to contribute until then.
The option for members of the NHSPS who joined it before 1 April 2008 (the '1995 Scheme Section') to transfer membership to the new NHSPS (the '2008 Scheme Section') is not available yet but is scheduled to be open from early 2010.
Also the details (such as the terms for converting existing membership and the late retirement factors) have not been published yet.
At present, it is impossible to say categorically in what situations it might make financial sense for eligible members to transfer to the new scheme.
Assuming that existing membership/pensionable earnings are converted on a like-for-like basis, provisional estimates suggest that anyone planning to retire before age 64 or 65 would be better off staying in the 1995 Scheme Section.