"Children" in Afghanistan around age 12 are shooting AKs.
People of 60 are still out shooting big guns.
I think you are being overly harsh on the young and old in regards to what they are capable of.
Yes, but the children in the Middle East have been handling a gun since they were 3. The average American kid has not. HUGE difference in cultures.
Or I am being realistic? Fact of the matter is, most people 65+ and most kids, say, below the ages of 17, wont take arms. Most women will not either.
Your 300 million is a FAR cry from accurate. Even if some elderly people and kids decided to take up arms, it will still will be below 300 million. Hell, the 50 million disabled people already knocks it down to around the 250 million mark, depending what their disability is. Heck, this probably doesn't even include all the people with chronic medical conditions.
I think you're being to generous in terms of who would take up arms against the government.