TFLY,
As a mom with 3 kids you have probably faced a lot more difficult tasks than basic training has to offer. You are not "that" old either.
Time, like all things, is a resource, and you have the luxery of having lots of it. Since you'd just be applying, your BMOQ is *over* a year away (it wouldn't be until the summer of 2011). That is plenty of precious time to get into the shape you need to be in.
At 11 pushups, you are already past many of the 18-20 year old girls that were on my course, some who needed until week 8 to get the 9 pushups that were required. 27 situps is sufficient. Obviously "sufficient" is never enough, so don't stop working on your core, but, what I'm saying is, you're already clear for 2 categories of the CF Express Test. With over a YEAR to get the other 2 (you may already be in the clear for those as well).
If you need anymore encouragement than that, know that a 46 year old mom was on my BMOQ this summer, and was not lagging behind. In fact, she was the first female to clear the 6 foot wall (an obstacle on the obstacle course), and left all those 20 yr old young guns behind.
Also, you'll probably breeze through inspections if you're anything like the more experienced women that were on my course. Some of them needed more encouragement on physical stuff (no more than some of the young people that showed up out of shape though...) but I was often running to them for help when it was time to get ready for inspections.
