I have talk about this debate in three different areas. I have a December birthday, September birthday, and I actaully skipped a grade like aprilgail.
As for kindergarten nowadays, it is not your paste and nap time that we remember. Due to the No Child Left Behind Act, you will see more emphasis on literacy and numeracy. Children will be writing and reading by the end of kindergarten in my childs district. I also had my daughter doing addition and subtraction in kindergarten as well.
As for readiness, my son was more than ready, but with a December birthday, he was one of the oldest ones. My daughter turned 5 on the first day of kindergarten (talked with pediatrician and her preschool teachers), and after the first few weeks, she was fine. She is one of the younger ones, (but not the youngest), and she is reading, writing, and doing numeracy higher than what is considered developmentally "ready".
If given the chance, my son would have done fine. He was reading, writing, and understanding math concepts even before kindergarten. Kindgergarten was boring for him.. he wanted to go right to first grade! However, some boys can't handle early kindergarten!
Many districts offer a readiness program. My school district offers a "free" readiness program for 4-5 year olds. If we had lived there when she was 4 I would have done it.
As for working from home, I have used workbooks (bought a whole bunch of them at a goodwill store), read to them all the time, only watched Public TV for the first four years, and took them everywhere.. museums, festivals,e tc (and all the while talking about the exhibit, etc.)
And yes, I was 16 when I was a senior in high school. That was rough. It was also rough being a 17 year old college freshman.. but I survived. Looking back , it wasn't the roughest, hardsest thing that ever happened to me.... it gave me something to learn from.