My takes is that it's mostly a combination of 3 factors:
-What Kaiserguard said. Old people have different interests than young people, and tend to side with the right more often, except on pensions. As Europe gets older, the right will gain a natural advantage as long as they seem tamed on pension reform.
-A global tendency. Note that the most leftist and social-democratic tendencies of the US Democratic Party, or the Canadian Liberal Party, and many others worldwide, were largely abandoned since the 80's. So many leftist parties lost a bit of their old identity, and this may be bad electorally. This has to do with multiple and complex factors and may need a thread of its own.
-Simple response to the 2008 crisis. Lost of social-democratic parties were in power, so they got kicked out. When right-wing parties were in power they also got kicked out (or will get kicked out, as in France).
-What Kaiserguard said. Old people have different interests than young people, and tend to side with the right more often, except on pensions. As Europe gets older, the right will gain a natural advantage as long as they seem tamed on pension reform.
-A global tendency. Note that the most leftist and social-democratic tendencies of the US Democratic Party, or the Canadian Liberal Party, and many others worldwide, were largely abandoned since the 80's. So many leftist parties lost a bit of their old identity, and this may be bad electorally. This has to do with multiple and complex factors and may need a thread of its own.
-Simple response to the 2008 crisis. Lost of social-democratic parties were in power, so they got kicked out. When right-wing parties were in power they also got kicked out (or will get kicked out, as in France).