Most research centers agree a generation is anywhere between 20 and 30 years. Recently, there’s been a lot of disagreement over the start and end of the Millennial generation. It’s been useful for leaders to look at the specific events defining this generation. If you’re trying to calculate your own generation within society, use the simple guide with your birth year above. Otherwise, if you’re trying to calculate a generation within your family, there are other steps to take. Whether you’re identifying your ancestor’s generations or your future children’s generations, this is a common thing to consider in your own genealogy.