Too bad you don't live nearby -- I am a mushroom hunter too! I tried a local group but they were very unfriendly. I found a friendlier one but actually like hunting solo so I can keep my good picking spots a secret
I am in my mid-30s and have always preferred to have friendships with men. After meeting my boyfriend, I felt a little weird doing that and have switched to trying to find female friends. It is different. I enjoy some of my friendships with women, but I also find that they take a lot more energy to keep up.
Meetups can really vary area by area. I have not enjoyed the people I've met through Meetup in my area. I have had better luck meeting people through classes that go on for a few months. I was pretty happy with the gardening class I took last spring -- there was a great mix of people.