as long as she's 18. oh wait, wrong question.
I have personally used 2 row that was close to a year old (or just over) and stored well in plastic then in a sealed bucket. used it to make a 1.039 cream ale of all things and there was no noticeable off flavors or anything. the grain was even still pretty crunchy. if you think it may me a little soft for milling, stick it in an oven set to 150 for 20-25 mins on a cookie sheet, stirring it up every few minutes. this will dry it back out without adding any darkness to the grains.
p.s. no noticeable difference in efficiency either.
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