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Well I am totally bewildered. Maybe Malone will sort it out for us.

Yes - it fits perfectly and has to be correct *s*f*l *i*e

This definition indicates that it is an estimate of the likely period of time that an asset is likely to be fit for purpose - I.e how long before it is likely to have outlived its usefulness

http://www.investopedia.com/terms/u/usefullife.asp

You deserve a medal, zozozo

Not really - I just googled the term

Aha, Thanks for that Z. I wasn't tempted to explore further but I have bookmarked it in the event of a bout of insomnia occurring!!

Have a medal anyway, just for bothering to google. I am still suffering from Guardianitis :(

Hope you at least had a nice walk