You are likely at your most vulnerable right now and needing more solace and companionship than usual.
You mention a 28 year partnership which you legalized by marriage at the eleventh hour due to Cancer. It sounds like you anticipated the legal repercussions of marriage even after the death of a spouse.... Re: Property rights, Wills, Children (by you or another) etc.
Having said that, nothing wrong spending time with your young friend, as long as you're not being taken advantage of economically or otherwise. You waited 28 years the first time, so no reason to rush into anything now.
Royal Mail threatens to stop deliverys over dog attacks


