Curious, but not asking, were you thinking of romance without the possibility of marriage with the dinner companions. It may be that you were/are unsure.
It seems that you need family. You probably have great skill with raising boys. You might think about foster parenting. It's impermanent and can bring tremendous joy.
Oh, the daughter-in-law that doesn't call. I don't think you'd forgotten that your sons lost their mother.
Ten years might mean that you'd be ready for a relationship or that you will never be ready. But don't quit in discouragement. There are too many lonely people out there that you could help.