Wouldn't worry about it. Especially if the seals are unbroken like S Keith said.
I've used fluid from unsealed containers that sat around for probably over 5 years. Not in the Insight, but on my Accord. Yea, apples to oranges, but didn't notice anything adverse.
1989 Accord Coupe, 260k+ miles & going.
2011 Insight EX, 180k miles, RIP.
2012 Lexus CT200h, 80k+ miles & going.