Financial independence is the state of having sufficient personal wealth to live, without having to work actively for basic necessities. For financially independent people, their assets generate income and/or cash flow from dipping into the assets that is at least as great as their expenses person's assets and liabilities are an important factor in determining if they have achieved financial independence. An asset is anything of value that can be liquidated if a person has debt, whereas a liability is related to debt, in that it is the responsibility of one possessing it to provide compensation.
It does not matter how old or young someone is or how much money they have or make. If they can generate enough money to meet their needs from sources other than their primary occupation, then they have achieved financial independence. Age is potentially irrelevant with respect to financial independence.
Passive sources of income to achieve financial independence.