Help with a Formula or Macro

Good evening all, I am a brand new user to the forum. I am working on creating a spreadsheet for a friend to track kids he has sign up for a soccer league. I have created a main sheet that will be a master list of all kids. I have created additional sheets for grouping kids into the following age groups 3-4, 5-6, 7-8, 9-10, 11-12 and 13-14. I am looking for guidance on how to pull information from the main sheet and autopopulate it to the corresponding sheet based on the column for Birth Date. I had envisioned having a cell on the main page that you could put the current date and it would work backward from there to determine age. I would also like to be able to sort by color on the subpages so that you can identify kids that were born in each quarter of the year. Jan - March = Red, April - June = Orange, July - September = Yellow and October - December = Green. I am very much so a rookie in this area, so any help that you can provide in steering me in the right direction will be greatly appreciated. Thanks very much.