"Why should I put in 6-10% of my salary when I don't know what 25 years from now look like?" To me that's even more of a reason to put money aside. in 25 years

"Why should I put in 6-10% of my salary when I don't know what 25 years from now look like?" To me that's even more of a reason to put money aside. in 25 years social security may be bankrupt. I personally put 10% aside in addition to the employer's match (so in effect 13%) and I'm 28. Note that there is a yearly limit (somewhere around $15,000 I think, not really sure).