My magic faction tribe has been going for months but I have never had a villager reach 90. So its impossible to complete the game. Has anyone else ever had this, I have everything else, all my collections puzzles etc and it would be nice to complete the game. I have tried giving them health potions when they are elderly but this doesn't stop them dying of old age?

It's possible. I've done it. Look here.

When I was trying to get that award, I left my game alone for a few days. When I came back, I had three 98 yr olds.

I've had one villager live to 101.