But you still benefit even from the mere _existence_ of human beings younger than you are (e.g. service, manufacturing, research, medical, etc.). If you think you don't, think about the fraction of people you will interact with in 20 or 40 years that are younger than you will be, or about the innovations you will be using in 20 or 40 years that were developed by people younger than you. Those human beings have to come from somewhere - why do you insist it my obligation to make you that gift, at exorbitant expense of my time and money?

Presumably you're not paying taxes to <whereever you will retire to>, but you reap the benefits of the people that did pay taxes there during this time. So it works out in the end. It's the same thing, just at a global level instead of a national level. Admittedly, the rules aren't the same everywhere.

Plus, as noted elsewhere, you are getting benefits from the taxes you're paying now, only just on some of it.

> likely won’t retire here so won’t use those either

I don't know which country you're living in, but surely the money you paid into a pension scheme - be it public or private - doesn't just disappear because you moved to another country?

Spain is famously full of UK pensioners receiving and spending their pounds there. Heck, my father worked for a few years in Belgium in his youth, without even being a citizen, and that still entitled him to a (minuscule) Belgian pension later on, in addition to his more substantial one from his subsequent decades of work in a different country.

> not a citizen so don’t enjoy some of the benefits of military protection

Can you explain what you mean by this part?