What now? What do you say to someone who feels that way? What can you say that will make them feel like a whole person again? Is there anything that can be done?

I already answered that question:

In the grandparent post, I wrote:
What do you say to such a person? You say "you've been raped." The same as if he were 8 or 18 or 28 or 88 and in a position where he was scared to say "no." The only difference between a 14 year old and a 28 year old in this case is there are a lot more situations where a 14 year old may be intimidated compared to a 28 year old. It's the intimidation, not the age itself, that makes it rape.

By the way, it's not the fact that the now-grown man feels abused that makes him abused, it's that he was abused.

If he had been in a non-abusive relationship at 14 (whether his partner was 14 or 44), then had regrets and he convinced himself he'd been abused, that would be a different situation requiring a different approach to healing. In that case I'd recommend a therapist to help him accept what actually happened and get beyond any guilt. Likewise, if someone ELSE convinced him he'd been abused, that would also require therapy, but this time to undo the damage done by whoever convinced him to believe in a lie.