Looks like 40 is still a limit at Cargolux...
In case, like myself, you're 40 or over (I just turned 40) it's probably not worth spending time doing the application form. Have the hours, licenses, plenty of Boeing time, etc and just received the "we're not interested" email. Three colleagues of mine with almost identical CVs were invited for selection. The difference? All late twenties.
Looks like ageism is alive and well in Luxembourg! Oh well...
P