Look, you can be old and rich or young an poor, but being old and poor is bad shit.
A surefire way of doing the wrong kind of things is to spend your money early or try to live a good life quickly without thinking about the future. Or if you have an ok job or income to think that is enough, even if you cannot save.
All young people, understand that time an money are linked. It is not the same to invest early than late, it is not the same to invest more early that try to invest more later. 100 is worth 100 today, but 800 in 20 years if you play it safe but well. Make no mistake, you will need to start creating your wealth.
Many people don't realize that you can already have a good pension with small sums of money without having to make major cutbacks as a young person.
Let's say a 25 year old saves $100 a month in an S&P500 ETF for 40 years. $100 is not that much money, or for most people it means that they don't have to limit themselves much in life, at least for most people in Western countries. The S&P500 has grown by about 10% a year the last decades. After 40 years you would have paid in $48k, but the value would be around $650k thanks to the interest rate. That's a good way to spend your retirement. If you now increase the monthly savings rate a little to perhaps $200 or $250, you would already have a fortune in the millions.