My skills as "skilled craftsman" are from what I see, OBSOLETE!

I need a job that pays better than $6, $7, or 8$ dollars an hour. Before 1999, my self-employment as a Marine Surveyor, 9 years, earned me a respectable income worthy of what we call a normal living.

Now, more than 5 years later, and out of the circles of surveying, was SAMS, now defunct, I'm 50, and wonder what jobs I can find employment. I'm under the gun now, I've got to produce, yet my memory is failing as most who are over 50 can attest, am I wrong?

What shall I aim for with limited education, that from my past which is, or has become, OBSOLETE!