Friend I agree with you that second name for Genesis block that you can use could be zero block because it is the very first block after the creation of blockchain and after that I agree with you that each block at blockchain have its on importance but especially for the Genesis block we should know and we should have basic information being a steemian.

You use subtraction method for calculating age of this blockchain and for this purpose you subtract timestamp of latest block with timestamp of Genesis block and you use the easiest method for it but it requires some more explanation and in next question you explain that it is down time but you explain very briefly that why it occurs so it also requires more gets over all I like your post and I wish you good luck in your participation.