15 year old beer: Safe to drink?

So I ran across this post and had to ask. I have an unopened can of budweiser frrom 1974. The lable is printed upside down on the can. Its so old its starting to get hard to see the lable. The can is a bit rusted. Not sure how many more years it will last. My question is would it be harmful drinking something from a can that old? Im expecting the worst on taste, curiouse to try, Maybe I'll save it untill it turns 50 Im afraid to just hang onto and it start leaking.