Old Ages

Why is it that when your young, age is one of the most important things in the world. At a really early age your obviously days, weeks, then months old, but even when your 1 year old, your described as 12 months, one and a half and your 18 months, all the way up until your 2.
Then your age in described in fractions, always 4 and a half or 13 and three quarters or whatever. Then it becomes less important and you’re a whole number 15, 24 etc (just in case you didn’t know what a whole number was).
Once past about 30 however, you forget all about age and you completely forget how old you are and have to calculate it from your date of birth (that is if you can remember what year it is) when asked. Or you just lie about it, and pretend your younger than you actually are, that’s mainly a woman thing though. My mother in law lies about her age so much that she now has to lie about my wife’s age, just so it checks out.
Then it goes almost full circle, when you get into your ‘twilight’ years. You all of a sudden remember EXACTLY how old you are, Alzheimer’s or not. Because then you have bragging rights, and will use those rights all the time, even just to start a conversation off in a doctors waiting room, “I’m 81 nearly 82 and I’ve got all my own teeth”.
Not sure the point of this little story, just my thought for the day……