Not only should it not matter, but it's illegal for employers to ask about it or consider it in their hiring decision, so having it right there on your CV puts them in a bit of a tight spot. I think some recruiters will actually remove that type of thing before forwarding it on to the interviewers and hiring people.
On the whole I hate the practice, but you have to consider cultural norms when doing the job-hunting dance.
There weren't a significant number of visibly-foreign immigrants in Germany till the 60s or 70s and it took a couple more decades before those were seen as anything other than 'temporary guest workers'.
The UK and France (and even more so the US and other "New World" countries) had at least a few decades head-start for culture to get around the idea of immigration.
So my only reason for including my age on the CV is because I look like I'm 24, whereas I'm pushing 31.
Photos make it easier to hire people like us :-(