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I have used grains that old and it's been fine. Maybe if you have some kind of super palate you might be able to tell the difference but my friends and I can't.
The only time I would be cautious of ...
I think you're good, if you're cold steep gave you the color and flavor you wanted.
Just a note. Tannins give the bitter astringency and are only extracted from husks when ph is above 6.0 AND temp is ...
Grain absorbs approx 1 litre per 1 kg, that's the only hard-and-fast rule, everything else depends on recipe and on what you're trying to achieve.
Do I understand right that your fermentable base is ...