J.G.
I'm having a similar issue. My older kids are grown (23 and 19) and I just had my daughter on my 42nd birthday. I have no friends now! My friends have all raised their kids and are in grandparent mode. I am too, to a certain extent, but also a new mommy (so much has changed in 19 years!!). I have a friend at work that also started late, her kids are much older than mine but I am still able to talk to her about pretty much everything. It's important to find someone you have more in common with--I love my friends but we're on different channels now -- they're on HGTV and I'm on the Cartoon Network!
I posted a request looking for Mom Groups in my area (Natomas) but have received no responses yet. Most of the groups I've seen are for SAHM's, so you shouldn't have a problem. I work full time and I don't think other mothers who work really have time for groups too... but the lil girl and I are bored and need new friends! lol