end of year

Another year is coming to a close so quickly. But why does it feel like time is moving faster and faster? The theory goes that when you are younger,say 2 years old, a year represents 50% of your life! Up to that point that's all you know and experienced and thus the longer time feels. When you're say 23 as I am now, a year is 1/23 of your life. As you age, the fraction gets smaller and smaller and thus the shorter a year feels as there's now a wealth of experience behind you in those 23 years. What have I accomplished this year? Have I done what I set out to do?