Of course it makes sense. If you put $50 in when you're 18 you'll have $20,000 when you're ready to retire. If you don't add ANYTHING else to that account over the fifty years that you wait for it to grow, you'll have around $20,000.

Imagine if you put in $50 a week, or every two weeks, or every month after you get a decent enough job. Or, maybe you want to up it to $100 a month or more. There are no limits. If you live below your means and invest your money in something worth while then you're financially set.