Save money wherever you can. Budget. Buy everything second hand and resell it before it loses too much value. If you do this efficiently, nothing will ever cost you anything. Grow your own fruits and vegetables. Rear chickens. Make your own alcohol. Steal your neighbours wifi. Don't replace your socks or shoes until your toes are sticking out of them. Whatever you save, invest it... I started a small business about 10 years ago. Now, I could quit working and just live off the money I get from running it. But, I'd rather keep working and saving and investing.
I will retire around the age of 50 and pay someone to run the business... or maybe sell the business and just put my feet up. I'm happy not being rich. All I want is enough money for my family. I don't need a fancy car or the latest iPhone. No fucking way I'm working till I'm 65, if all I have to do is make some sacrifices.