answer:According to my brother, his daughter had more trouble with turning 30 than she did turning 40. I think he told me why, but I don’t remember what he said. I had a struggle with it for a week when I was 45. The trigger was a kid asking me if I had any grandchildren. I’ve been occasionally struggling with it since I was 62, because of my arthritic right knee. I’ve been trying different therapies, and if I find one that’s successful for a good length of time, then that might postpone the struggle for a few a few more decades.