Lpc2000

Hello to all, this is my first post in this group.

I'm thinking of using the LPC2138 in a design that must have a 20
year life cycle. The literature says the flash has only 10 year 
retention, but in other flash devices that is affected by
temperature, write cycles etc. 

Is there any more detailed info on this? For example, if I only write 
to the flash a few times and keep the temperature below 60C, can I 
expect longer retention?

Cheers
Dave