widowed since 2006 can I file widowed?

No. This is not allowed after the second year of filing a return when a spouse dies (married filing jointly in the year of death and then and only if there are children dependents. 

• Taxpayers can claim the qualifying surviving spouse filing status if all of the following conditions are met: You were entitled to file a joint return with your spouse for the year your spouse died. Have had a spouse who died in either of the two prior years. You must not remarry before the end of the current tax year.
• Surviving Spouse - Understanding Taxes -Filing Status

You must file single unless you do have children dependents. You can review the details for head of household filing status to see if you qualify.

• Guide to Filing Taxes as Head of Household
• Do I qualify for Head of Household in 2024?