Lpc2000

Hi, I needed a bit more speed in my app, and I suppose i could of
tried to optimize it a bit, but I was feeling kinda lazy.  So I
decided to overclock my lpc2134.  I'm using a 14.745Mhz XTAL, normally
i was running at 59.0 Mhz with a flash access time of 51ns.  First I
went to 73.7 Mhz (xtal*5) and 54ns flash access time.  Everything
seemed stable and my app ran about 8.1% faster, my current draw went
to 65mA.  Then I decided to up the flash access time (73.7 / 3 ~
24.5mhz) to 41ns.  With this config my app ran 23% faster, and the
current draw rised to 67mA.  The current draw at 59Mhz is 56.5mA. 
I've summerized my results in the table below:

+--------+---------+--------------+--------------+---------+---------+
| PLL_M  |  MAM_T  | SYSTEM CLOCK | FLASH ACCESS | CURRENT |  SPEED  |
+--------+---------+--------------+--------------+---------+---------+
|   4    |    3    |   59.0 Mhz   |    51 ns     | 56.5 mA |  100 %  |
|   4    |    2    |   59.0 Mhz   |    34 ns     | 59.0 mA |  116 %  |
|   5    |    4    |   73.7 Mhz   |    54 ns     | 65.0 mA |  108 %  |
|   5    |    3    |   73.7 Mhz   |    41 ns     | 67.3 mA |  123 %  |
+--------+---------+--------------+--------------+---------+---------+
Note:  My application blinks an LED that draws about 3 mA.  

Has anyone else experimented with overclocking the LPC21xx series?
Do you think overclocking this chip significantly reduces its lifetime?

Cheers,
Mark