So you want the retirement age increased and for people to work longer instead of enabling policies that allow them to retire at the same age their parents did? That's nice, I guess.
Those "donor countries" are largely developing countries that are suffering from overpopulation of youth and a lack of an elderly population to support them due to much poor conditions and lower average life expectancy, basically the opposite of developed countries like the UK. It's almost like the current situation is a good thing for both of those sets of countries, or something.
Anyway you can talk all about controlled immigration all you want but from the stats so far it looks like the UK will let every bit as many people into the country as they were prior to the referendum, they just won't be from the EU, so .. yay?