dumpe2fs will provide a date for the original installation at least with ext 2,3,4
woodsmoke @woodsmoke-desktop:~$ dumpe2fs
dumpe2fs 1.42.5 (29-Jul-2012)
Usage: dumpe2fs [-bfhixV] [-o superblock=<num>] [-o blocksize=<num>] device
woodsmoke @woodsmoke- -desktop:~$
woodsmoke @woodsmoke-desktop:~$ dumpe2fs
dumpe2fs 1.42.5 (29-Jul-2012)
Usage: dumpe2fs [-bfhixV] [-o superblock=<num>] [-o blocksize=<num>] device
woodsmoke @woodsmoke- -desktop:~$
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