Did you know that if you have lived as a foreigner in Argentina for 20+ years you should be eligible for a PUAM state pension over the age of 65? It's 80% of the minimum.
Adri is an accountant and we checked this out as legit, but it's worth double checking the small print on your DNI because it shows two dates - one where you entered the country and the other, usually three years later, which is called radicacion. It seems the latter date is the important one. Also, you don't need to have made the full contributions.
I also checked if there is any conflict with receiving a state pension outside Argentina eg UK and you can receive a pension in two different countries apparently, according to the UK DWP.
On the other hand, if you take Argentine citizenship, it's ten years residence.