I was wondering, with all the money invested in 
cels, exactly how long can they last? 'Coz they 
were meant to be used in the production like a 
one-off thing and not meant to be 
kept...Sometimes I cant help but wonder if it's 
worthwhile even tho I love my cels and would want 
to keep them for life..and possibly pass it on to 
the next generation..

How old is the oldest cel you've seen? 20-30 yrs?
The oldest cels I've seen and still in reasonable 
condition would be those of anime produced in the 
70s.