Im 24, 25 later this year....
I played a few gigs, like about 4 or 5 perhaps more without ear protection and a couple of band practises (albeit damn loud band practises) my ears are very sensitive so in all those situations i recognised that it was too loud and put toilet paper in my ears.. then I got myself a pair etymtotic 20's the ones that arent moulded into your ear, wore them religously (forgot them once or twice) and for the last year I have had custom moulded ones with 2 filters 15db and 25db.
So i have actually been proactive in looking after my ears... too the point where it is just a tad obsessive! Like i get real angry if someone accidently makes a loud noise near my ear...
I find the ring happens in my left ear usually after a cup of coffee and a smoke as well as after mixing for a prolonged period (although i do mix ant generally low levels.!)
I have been reading that Caffeine, nicotine and anti inflammitory drugs( ibuprofen, aspirin) can cause the ring... Allergies and Sinus problems can also do funny things to your ears..
As i said it is not constant, or periodical, and usually doesnt last for more than 15 seconds.... and sometimes there it doesnt happen for 2 or 3 weeks.
Mybe its just my ears tellng me to take a break who knows..
The last hearing test i went to last year was positive with nothing out of the norm...
Perhaps I will book another appointment soon just to follow up.