Plenty of House members retire all the time. Senators tend to serve longer.
If you had at least half a brain left in that pot-addled head of yours, you'd have noticed that less Congressmen in potentially competative districts retired than is normal last time round and that big turnovers in the House tend to be accompanied by one side being very unlucky in retirements.
True, but's always been the case. It's not the result of gerrymandering (although it's true that there's less of 'em than there were in Rayburn's or even O'Neill's day).
You may or may not have noticed, but several longserving Congressmen in potentially competative districts had only a paper candidate running against them. If that.
Bullsh**t
Know what? You don't need computors to draw a really foul partisan gerrymander. It just saves you a little bit of time. That's all.