It really depends on what your definition of the word, 'friend' is. Since my 30s, I've made many new friends, but understandably I don't feel as close and tight with them as the friends I made in my late teens or early 20s. This could change with time, however. I agree that it gets harder to make friends as those friends already have their own friends and at some point people don't want new friends and simply tap out. Since many people are already married in their 30s, it also gets harder to create those shared memories (at a party, trip, etc) that really strengthen and mold friendships.