Out-gassing of printed material when heated
This is not an answer to your question, but it relates to outgassing so I am sharing it here.  

I have used the acetone vapor method of smoothing the surface of ABS prints.  It works really well, and the surface becomes much smoother and glassy.  I printed a large coffee mug (lets, for the moment, ignore food safety issues) and made it very smooth.

After a couple of weeks to allow the acetone to fully evaporate, I poured a nice, hot cup of tea.  Unfortunately, the acetone had not fully left the print, and the surface was immediately covered with dozens of bubbles as the acetone evaporated and pushed against the ABS.

This effect was only because of the acetone.  Another cup that had not been vapor smoothed worked perfectly and was unaffected by the hot water.

I have not seen similar outgassing from PLA, ABS, Nylon, or PETG.

If I may hazard an opinion about the substance of your question...

I don't think that outgassing is the biggest contributor to the aging of prints and their properties changing.  I suspect that (perhaps not in order) these are larger factors:


exposure to UV light.  UV light breaks polymer bonds and reduces
the strength of plastic.   
absorption of water vapor, which can both expand the material which causes stress, and chemically break polymer bonds.
long-term crystallization of the material
fatigue from repeated sub-failure stress


NASA used to have resources that spoke to outgassing rates related to suitability for space applications.