How do you get Tech points after all puzzles are solved ? None of my Researchers will research unless I keep sending them back to the table every 30 seconds. Now that my Golden Child should be 72 years old I have not one Master Researcher.

Once you have all the techs researched, your villagers won't go to the research table on their own -- if you need a master scientist, you'll have to force them to research as you described.

(I'm curious, though -- if all the puzzles are solved, why do you need a master scientist? Maybe it's just me -- I like playing new villages rather than picking at my old ones )

And the Golden Child never ages, little twerp

Mine still research. I have tripled my points since I solved all the puzzles. Most of the younger researchers are Master Scientists.

I keep some on the table so they won't wander around bored or become farmers. How much fish does one village need anyway?

They will continue to research until all of the tech levels have been "purchased". Until then, they will continue to research.