What are the percentages of the military by age?

I'm doing a paper about military recruiting in high schools and I'm having trouble finding the percentages of the military for each age group. It would be a great help if you could give me a link to a credible source(I have to cite my sources so a link would be much better than straight facts)

Thanks in advance.What are the percentages of the military by age?I thought I had found a great link (the first one) but it turned out to be mislabeled. It still might be useful to you. Where it lists "by age" it actually shows by rank. The second two links might be more helpful. Play around in the Summary and content sections and look for age. Just a quick search only gave me age by recruit, but I think you can dig deeper here and find what you need. Good luck!