That's the reward

maximum 115 (

unless your 114th villager has twins or triplets) ...
Depends on how you view the game -- some people quit it when all the "goal oriented" accomplishments have been met. Some like to keep seeing how the village is doing on its own, helping out with keeping the fires stoked, changing villagers occupations if they are not happy at what they're doing, helping to teach new healers about strange plants so you always have those who can keep the tribe healthy, helping out where needed and basically let it progress the way it will. You can also build on your stats the longer you play, events still happen. Banging the gong -- well, personally, I don't anymore .... got too many negative effects to justify subjecting my villagers to it).
As another poster on a different thread found out, the game is only really over if you don't have any breeding females and the rest of your tribe dies and you get a screen saying "game over". Otherwise, it's over when YOU say it's over. BUT if you have done a really good job of balancing your tribe, it can go on and on and on

and as in real life, other things happen besides strictly goals ... time to stop and smell the roses and enjoy just being. So it is really up to you where you want to take it

Sometimes, like in real life it is all on how you look at it; sometimes it is the
journey, not just the destination that life includes

(again I say LDW, how very ZEN of you!!)