We have organizations in Germany (Rentenversicherungen, national pension funds) that can predict the exact day when Germany will officially become a retirement home with more pensioners than young people.
That day is frighteningly near.
According to these figures the median age is already (almost) as bad as it gets: https://www.statista.com/statistics/624303/average-age-of-the-population-in-germany/
Not considering regional effects, like lack of immigration into federal states with large amount of neo nazi population. They will be fucked more thoroughly.