I know it is hard to convince young people the importance of saving for retirement when they first start working. I was in my mid 20s when I started and it was weird to think there were more years until retirement than how old I was. But when you start early you have the power of time and compound interest on your side. Also, if the employer matches your contribution, you are leaving money on the table by not investing.
It may be difficult to put aside that extra money but if you make cuts in other places, before long it will become a habit. I consider it another bill so I arrange my budget around it.
Importance of saving early for retirement