Firstly in relation to working overseas, there is no definitive answer, it will depend where you work and for how long, For example, I worked in the UK for 10 years and that may entitle me to some portion of a UK state pension. I also have a pension with my employer in the UK which I've never transferred back to Ireland as I can take it when I hit 60. Had I worked in another country and a different employer, my pension entitlements could be very different
I think though you are missing one key question here, why are you saving 50% of your salary, what are you aiming to do? Is it to travel, emigrate, a deposit on a house etc. How much of your savings can you assign to that and then how much can become pension related?