To be clear, if you ask several financial planners how much you should have saved for retirement by the time you're 40, you're likely to get some different answers. There's no perfect guideline, and the amount of retirement savings you should have depends heavily on your personal situation, goals, and lifestyle expectations, as we'll discuss later.

With that in mind, Fidelity's retirement target for age 40 says that you should have three times your salary in retirement accounts.

So, if you earn $100,000 per year, this guideline says that you should have $300,000 set aside for retirement by the time you're 40. This is based on a few things, but mainly on the assumptions that:

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Source Fool.com