I'm lost too although in 40s and stuck in dead end job that has basically meant I've stagnated for 15 years while all my peers have 2-3x me. I'm left behind and fear it's too late with the current economic climate.
If I wanted to I could probably stay at the same company for the next 20 years and retire but that sounds uninspiring and ultimately quite depressing. Two years ago was the time to do something but now is OK too. In another two years I will look back thinking "why didn't I make a move then?"
I know the feel, wish I had something better than my own story for you!