What I want to know is the rate of growth. Doing so will tell us the story of their mortality rate. It is like you wake up one day, you grew 1 foot and you see a difference daily.
Like our pet dogs. From puppies to adult in just 1 year. From birth to death in about 10 years so you can see a big difference per month to your pet dogs. With humans, some people just looks the same, no matter how many years have passed on by.