Whoah, hold on a sec here.... I think it's important here to clarify what we're talking about when we say "AMD's are overclocked more". AMD chip OWNERS are more likely to overclock their CPU's for several reasons, one of which is the high heat-tolerance of Athlon CPU's. Another is the fact that you can unlock the multiplier of AMD chips, unlike recent Intels, which means a lot more versatility when overclocking AMD's.
But there's nothing forcing anyone to overclock their Athlons... and it's not as if AMD themselves is doing any kind of overclocking. They're just making it easier for people to overclock the chips if they choose to do so.
As for Hossam's original question, he wasn't necessarily talking about the lifespan of AMD vs Intel chips, he was talking about "performance & quality" over time. Not sure what he means by "quality", but the idea that PERFORMANCE of a CPU could actually decrease over time is pretty absurd. The performance of any Windows PC can degrade over time due to OS issues (i.e. "Windows Bloat") but the components inside are not going to degrade over time performance-wise.