Does anybody know if there are long term studies about the effect on health, of drinking milk? I have been drinking a gallon of full fat milk every five days,

Does anybody know if there are long term studies about the effect on health, of drinking milk? I have been drinking a gallon of full fat milk every five days, for 40 years (yes, that is about 3,000 gallons of milk). I am kinda wondering if it is wise to continue for the next 40 years...