Five years experience?
Apostrophe or not?
I am never sure about this.
EightiesChick
Tue 10-Nov-09 12:25:19
Yes, technically it should be five years' experience - as per Lynne Truss's discussion of the film Two Weeks Notice and how it should have been Two Weeks' Notice
However, almost everyone is unsure and nervous about this particular aspect of apostrophe usage so if you've already written it without the apostrophe, I doubt anyone will say anything.
apostrophe... can't remember the reasons but there just is 
RnB
Tue 10-Nov-09 12:26:16
Five years' experience is correct
RnB
Tue 10-Nov-09 12:27:44
Whenever youre wondering whether a phrase like this needs an apostrophe, try mentally substituting one for two (or whatever other number is in the phrase youre wondering about). Two years experience and two years experience sound the same -- but one years experience and one year experience are easy to tell apart. And of course youd say one years experience. Youd also say one weeks notice and one dollars worth. Just remember, when you go back to your plural, to put the apostrophe back after the s, where it belongs on a plural possessive.
RnB
Tue 10-Nov-09 12:28:04
I copied that by the way. I;m not that sad 
EightiesChick
Tue 10-Nov-09 12:28:28
It's because it is possessive - it means '5 years of experience...' if you wrote it out in full. And the apostrophe goes after the s because 'years' is plural. It would be '1 year's experience' if that was the situation. HTH.
Thanks all.
Updating my CV and it would be nice to get it right.
RnB you shouldn't have owned up - I was terribly impressed 