I do?
Well, yes, I expect it got heavier with age. Don't know which way the cg arm went.
I do know that by a careful checking of the multitude of w/b calculations made on N8526J a 100 pound mistake was made. The pilot before me was flying it at 1750 pounds, thinking he was flying at 1650 pounds. I suspected the problem when I calculated the balance and found it far aft. I found the problem, had it corrected, and because the empty weight of the plane "increased" that "moved" the cg forward to a more reasonable location.
But, no, I've not had the plane weighed and I've not read of anyone who posted the change when a Cessna 150 was reweighed (or I've forgotten if I did.)
So I would still like to know the outcome if a plane has been reweighed.