The age of the metal doesn't matter, just if it's rusted away or not. If you're closing the (taillight?) hole, and planning on smoothing it over with bondo, then it probably doesn't matter.
But it it was me, I'd butt weld a patch in.
Kevin 1951 Chevy 3100 work truck Follow this saga in Project Journal Photos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together.
