I wouldn’t use them for a lambic. Traditionally the hops used would be stored open/warm and have started at a much lower AA%. That said I think aged hops are only really needed if you are looking to do a spontaneous/ambient fermentation. If you are pitching cultures/dregs just aim for ~10 IBUs of hops using whatever noble hops you can get your hands on (since you are not letting your beer cool naturally with all manner of microbes falling into it you don’t have to worry about some nasty microbe taking over).
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