I'm not over 30 but its hard to make new friends.. I have many friends from my childhood, but can't call somebody friend who I recently met.
The new people who you met are not friends, it must spend so much time with them to can call them friends, which in the adulthood its hard because you have job, chords, family, kids.. you can't spend some time with somebody who you just met, so I think its hard to make new friends when you are older..