At what age can I start receive my widows pension. Im 58 yrs.old,my husband passed in December 2009.We hve no children.

You can receive a survivor's benefit as early as age 60. However, if you claim the benefit at 60, you will receive only 71.5% of the PIA. Each year you delay claiming benefits, the amount will rise.
If you are 50 or over, and become disabled within 7 years of the worker's death , you can receive a survivor's benefit.

When your spouse retired, it is likely the benefits were paid out in the form of an annuity with "survivor's benefits"—what is called a "joint-and-survivor annuity."
Are you asking about a private pension plan form a 401K or a company pension?