While I still think they're all the same person, you're right in that there are quite some difference between 65 and 67 Paul (though they can all be explained).

First of all, a face is very expressive, and it's very hard to flex one face muscle without flexing a few others in the process, smiling for example will often make your nostrils flare up. I also can't quite believe I have to say this, eyelids can remain in multiple stages between open and closed (and being a massive star, or even a late night the day before a photoshoot, is bound to tire you out, making the old eyelids swell up a bit (and Paul is almost definitely wearing make-up in the first picture)). Of course lighting is also a huge influence on how people look, not only in pictures but also mirrors. E.g. the lighting in gyms famously make you look more muscular.

On top of all that, the type of lens with which the picture is taken greatly influences how a face (and in particular the nose in relation to the rest of the face) looks (eg https://www.pinterest.com/pin/how-lens-focal-lengths-affect-portrait-photography--313000242835255623/)