If u've a proper cooling with such a mild overclock your cpu should be obsolete before it dies (as others have replied). Though with 148fsb (37Mhz pci-bus) you might kill like your hdd or other pci-devices in the long run.
I've actually never seen a CPU chip die of old age - they just seem to go on forever.
As far as I know, the 8086 on my first computer, an Olivetti M24 is still going, and my AST 386/20C (1989) is counting oranges on a farm. Some of the components had to be replaced, however - but more due to obsolescence than due to failure.