I agree, you're never too old for new friends or new realtionships with old friends. But you should also know that you're not alone in these thoughts and feelings. My mother talks to me about her lack of deep friendships all the time. In my opinion people are constantly growing emotionally and usually at different amounts. This is because no two people share the same life experiences. You find growth from struggles such as death, or amazing moments like the birth of your children. Just because someone isn't going through the exact same things as you at the same moments doesn't mean you can't connect emotionally on the same level. You seem like a lovely person who people cherish.