I was diagnosed around age 30 (I'm 55 now). I believe I've had bipolar since I was a small child. I can't say that I have regrets exactly...more like shocking moments of truth. For example, having affairs, yes - but realizing and accepting that I was manic at the time and was so for many months! I'm finally, this winter, truly accepting the diagnosis I received decades ago. There's a sense of peace about accepting it.