Thanks to whomever for removing those pictures.  I am at my computer at work and, I don't know, would like to actually be able to read the comments thread of my own post.

To answer the question, I have no idea why some people have more hair than others.  Putin is old and fair.  Barack may or may not wax - who knows?  Frankly, thinking about the hairiness of world leaders is not appealing to me.  

"Pretending that you already know the answer when you don't is not actually very helpful." ~Migeru.