said by Ken:the close to the ends like in your picture the top and bottom are under much less stress. So drilling holes like that near the bottom and near the end of the joist is not nearly as bad as drilling in the same location in the middle of the span. This is only true for dimensional lumber though. Check if any of the joists are cracked
In the 2nd picture, looking at the wood grain, if it was going to split due to tensile stress it would have happened right there.
Ideally you drill in the center. The fact that the house is 50 years old probably is a good sign. I wouldn't worry about it unless there is obvious splitting damage that isn't seen.