How to find difference in years between two dates?

[John Machin]

Bruno Desthuilliers wrote:
> John Machin wrote:
> > Bruno Desthuilliers wrote:
>
> >
> > Which pieces of the following seem to be working to you?
>
> John, it seems you failed to notice the use of "may" and "seems" in my
> post. IIRC, both are supposed to strongly suggest a lack of certitude.
>
>

I didn't fail to notice that you were seeming. Re-read my question:
It's asking you which bits you were seeming.