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man i don't know maybe things have change so much nowadays..knows..input from any of the actual 18-19 year olds on here?
Like you, I do wonder why an adult woman would be interested in an intimate, romantic relationship with a teenager and would indeed keep a very close eye on your son and this relationship, regardless of possible legal follow up available.
Your son’s honesty with you about his sexual relationship is encouraging and I would advise you to let him know that you are concerned about this but refrain from any personal “put downs" of this woman so as not to drive him to a more defensive stance.
Of course, you could “forbid” him from continuing this relationship and of course, he could ignore your limits.
So it’s important to find ways to continue to engage him in thinking about this relationship.