Calculate age between date/year and now to include months ie. 2.3 years

Hi all,

I've tried searching here but cannot find specific solution.
I need to calculate age of something installed until today's day but to include fraction of months. Here's my example:

A1            A2
1/1/2014      2.4

I found many solutions but they all round it up and don't include months. Let me know if you need more clarification.

Thanks,

-Marinko