This chart may be a few years old but it's extremely shocking. In todays dollars it takes $50,000 to $60,000 a year for a retired couple to live comfortably. That number will be substantially higher when my retirement starts. With social security, Medicare, and other entitlements going insolvent its important for the younger generation to save all they can. I don't plan on collecting social security in my 60s and if I do it won't cover much of anything.
If you work for a company who offers a 401k my suggestion would be to take the maximum match your company offers and no more. Don't burden yourself with saving all your money in this vehicle. Right now tax rates are at all time lows when withdrawing money out of these accounts. In the future I see 401ks getting hit with a higher tax rate of withdrawals.