There are many factors that go into someone having a well-being later in life. Yes it is true that a secure attachment can help in this well-being but as one takes the bumpy path otherwise known as growing up, many other influences can effect whether someone has a well-being. On one hand, a toddler could have a secure attachment but then be severely bullied in middle schol resulting in anxiety later on in life. On the other hand, a toddler with sme kind of anxiety might befriend someone in elementary school who is able to coddle them to a point of feeling secure. Every resulting senerio is formed based on events troughout life and not just in the baby years.
I agree that it is the experiences that you have during life/growing up that make you who you are. However, I think that having a good family environment is what is most important in developing feelings of security. A child may make great friends with others, which will make them feel secure, but without a good family foundation I don't think they will feel as secure in their early years.
I agree that it is not just in baby years that well-being can be influenced. Many of us have become wary of certain issues just based on something that could have happened less than a year ago. I feel that any part of our lives could influence our well-being because it is not set in stone when we grow out of our developmental baby years. Sure, the years of development have a significant influence on our current well-being, but many other factors in life since then are just as capable of affecting our well-being.
I agree with all of the comments. Attachment and secure relationships change over time by different events that happen to us. As people grow older, our attachments and quality of life changes. I do think that baby years do have an effect on how people view the events in life, but the view can change.