My villagers keep having male babies. Now the youngest female in the tribe is 40 and I'm worried that the game will end.

The game should balance itself out. For one thing, there isn't an age limitation in this version for the females.

Also, there are possible events that might help your balance. And you never know, you could have female twins or triplets.

All of my females have died, I have four males left so my tribe is doomed at this point. Are there events where babies float in like on the last VV?

I've not had one personally, but I have seen a similar event mentioned in the forum.