1. A method for tracking biological age comprising; receiving, with a computer readable medium, one or more user determinable biological age parameters including an actual age; receiving, with a computer readable medium, one or more system measurable biological age parameters from an activity monitoring device; calculating, with a computer readable medium, a biological age factor as a function of the user determinable biological age parameters and the system measurable biological age parameters; calculating, with a computer readable medium, biological age as a function of the biological age factor and the actual age; displaying the biological age.