I found the picture of RFEngineer (guy on the left):
"You don't know anything about the profession."
LOL...well as long as my customers continue to think I do, I'm ok with that.
Whether you want to admit it or not, there are things you can't do as well in your 40's as you can in your 20's. Aspects of engineering simply require the flexibility of mind that you (unless you are an unusual specimen) can't do as well in your 40's as your 20's.
I did not mean to imply that there are no engineers in their 40's.....I'm one. but there are engineering things I did better in my 20's and that I hire folks in their 20's to do for me.