Salaries in Europe are much worse than in the US. (I'm told for the best India pays better than Europe - though India is skewed by a lot of bad coders not making much). In US just maxing out your 401k for 15-20 years will do it (depending on your company match), and you still have far more than the average income left over. So if you live like the average person and save that difference as well 10 years seems doable.

That said I'm not sure I'd recommend it. It can pay off for some, but the future is unknown. I've been to funerals for several people who didn't live to 65. Your body starts declining as you get older so a lot of active things really need to be done young if you do them at all. Maxing a 401k seems like a good plan and then spend the rest today - you should still have a nice retirement if you live that long, but you can enjoy life now.

If you don't like the above, religion offers an afterlife if you choose the right one. However they agree choosing the wrong one won't... Good luck choosing.