Sorry I'm not near 60 yet, but I wanted to say that in some ways I feel that having some people in my life know has been helpful, until they start figuring that what my diagnosis is means that I'm the same as the next person with depression and bipolar, or when they seem to avoid me whenever I act a little differently. Some people I wish didn't know, and then they could just see me for who I am. It's difficult, last week I had a friend who criticised me, and she said, " I don't know if this is your personality, or your bipolar", and I had just told her I was diagnosed bipolar a few weeks before. That was hard to take. Because in a way, I feel like its all just who I am anyways.
And yes, it can be embarrassing to have not reached getting over my mental health problems, and it does seem to have to do with maturity as well.