At what point after you lose your soulmate and the love of your life is it okay to feel horny again?

It's bee over 7 moths since my wife passed away. Almost a year since I last had sex. Yes I will be 65 on December 3rd. I'm old. I'm not dead.

I still feel guilty and disloyal when I think about another woman. How long is appropriate before I can get laid without beating myself up with guilt?