You aren't alone. I had my first child at 35, the second at 37 and my latest at 40. Most mom's I know with kids the same age as mine are at least 10 years younger than I am. They have different ideas, interests and body shapes. So I know how you feel. I do just as well in that kind of group as I do in a group with mom's my age, but I find mom's my age are more laid back, very practical, and relaxed. They don't have to have the latest styles on, they don't feel the need to put their kids in every activity, they don't worry about their kids being put together every minute of the day.....
At any rate, I find that there are more women having babies at my age in my church than in my neighborhood. I go to a Babtist church so many have a big families and thus are still having kids in their 30's and 40's. Being I was raised a bit differently than you would find in a babtist church, I sometimes feel a little out of place there too.
Then again I've always felt a little different no matter the setting...so I'm use to it.
If I was closer we could contect, but I'm in Huntley and that's a good 20 to 30 minute drive for me. My in-laws live in S Elgin and my church is in Elgin so the drive once a week puts a strain on the finances as far as gas goes.
I wouldn't worry about the age of the other moms if you can find some to associate with. You will find that sometimes you can offer great words of wisdom in settings like that since you have been there and done that already. It can be a good thing.