Hairstyle associated with old school member? (4,6)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

MULLET (the 80s hairstyle that, unaccountably, seems to have made a comeback in recent years) after (associated with) GREY (old -hm, I’m quite old but not grey…). ‘School’ in the sense of a bunch of fish