Stardates are the agreed measure of time in Star Trek but even they have been open to intrepretation in the past. However, my question is the definition of a year in terms of age. It is highly unlikely that another planet would have the same Orbital Path transition time around its sun of 365.25 times it axial orbital rotation. So when a Vulcan says "I am 74 years old" and a human replies "so am I", are they really the same age? Wouldn't each species relate to their own definition of a year? OR has anyone ever seen a standard definition for it in Trek?