the top"
impossible
After I retired, before going back to work for a living, I contracted a year. It was only $75 an hour but the 60-70 hour weeks (averaged >60hrs/wk the last seven months I was there) got a bit much. I decided to retire from retiring. ;-)
I will be 60 this month. As I indicated above, some intermediate-sized companies dropped me like a dead fish when they figured out that I'd been around 30+ years. Others were quite the opposite. Both of my last employers wanted someone who'd been around the block a few times. The contract job needed a head that spoke VHDL.
I've found that a chunk of code or a few pages of a schematic work wonders. Another thing I found that works is to tell them about EMI test successes, even those that passed on the first try. ;-) It reminds them that kids do the dumbest things.