I have 3 kids, 2 of them girls whom I will have to pay for weddings, college, my wife stays at home, our retirement account is a joke after the stock market shrunk. I know some of that will come back...
But, I'll be working til I'm dead. My dad was gone at 52, so, I've learned that (to me) life is more than working hard at my job. I try to do my best with what time I have at work and then focus on my family. They will be the one's left really missing me once I'm gone.
Which really stinks, because, I'd be retired as soon as it is possible so I could do the things I really, truely find fulfilling (painting, music, travelling, family).
It all depends on your perspective. My perspective is more often that I have a Job, not a career. (Don't let my boss know that!).
As for capabilities, the generalities on the effectiveness of an engineer based on age is I think a pretty poor measure of a person's ability. I have met a lot of USELESS engineers who are across the age spectrum. Most of the well respected, mentor types I have known are almost all in their 40's and 50's. I think it does take time to gain experience and a sometimes it takes a willing ear to listen to their feedback. Even the younguns can sometimes have something to appreciate. There are always the newbies that are "young, dumb, and full of $@%^.". There is something that makes me appreciate those who are full of energy and spirit. They have yet to be beat down by the systems and years of negative conditioning that most of us have tolerated. Sometimes, they are the one's who question the status quo when others just accept it.
We all have something to learn from others around us. I lose respect for the engineer who isn't willing to listen to other's concerns, input, or feedback. Some may not think I'm genuine when I listen and then don't follow their feedback/suggestions... But, I do make an effort to respectfully see things from other's point of view.
I enjoy working with and around people, more than I do solving problems most days. The "field" is the place for me, and I can't tell you how many times some old "uneducated" operator has saved my ass from making a huge mistake by showing me what they know and what they've been through.