How can I set a default value for a datastore, and make a max value for an int value?

I'm making a food bar in my game but to do I need, if the player has joined the game for the first time their food is set to 100 instead of 0, but if they join for the second time it just datastores normally and saves their current food value. I also want to make a max and min food value so the IntValue cannot go over 100 or below 0.

local datastoreservice = game:GetService("DataStoreService")
local AgeDS = datastoreservice:GetDataStore("Age")
local MinutesDS = datastoreservice:GetDataStore("Minutes")
local FoodDS = datastoreservice:GetDataStore("Minutes")

game.Players.PlayerAdded:Connect(function(plr)
	local leaderstatsA = Instance.new("Folder", plr)
	leaderstatsA.Name = "leaderstatsA"
	
	local age = Instance.new("IntValue", leaderstatsA)
	age.Name = "Age"
	
	local minutes = Instance.new("IntValue", leaderstatsA)
	minutes.Name = "Minutes"
	
	local food = Instance.new("IntValue", leaderstatsA)
	food.Name = "Food"
	
	local success, errormessage = pcall(function()
		AgeDS:GetAsync(plr.UserId)
		minutes:GetAsync(plr.UserId)
	    food:GetAsync(plr.UserId)
	end)
end)
game.Players.PlayerRemoving:Connect(function(plr)
	local sucess, errormessage = pcall(function()
	AgeDS:SetAsync(plr.UserId,plr.leaderstatsA.Age.Value)
	MinutesDS:SetAsync(plr.UserId,plr.leaderstatsA.Minutes.Value)
	FoodDS:SetAsync(plr.UserId,plr.leaderstatsA.Food.Value)
	end)
	if sucess then
	else
			warn(errormessage)
	end
end)

Thanks!

I fixed it