Is there a way to detect if a player is 13 years or under?

game.Players.PlayerAdded(function(nP)
nP.CharacterAdded:connect(function(nC) -- connect event to anonymous function
local sg = Instance.new("ScreenGui", nP.PlayerGui) -- create the screengui
sg.Name = "Welcome" -- set its name
local fr = Instance.new("Frame", sg) -- create the frame inside the ScreenGui
fr.Size = UDim2.new(0, 150, 0, 30) -- set its size
fr.Position = UDim2.new(0, 0, 0.5, -15) -- center the frame
fr.Style = "RobloxRound"
local tb = Instance.new("TextButton", fr) -- create a textbutton, put it in frame
tb.Size = UDim2.new(1, 0, 1, 0)
tb.Style = "RobloxButtonDefault"
tb.TextColor3 = Color3.new(1, 1, 1)
tb.Text = "Click here to play"
tb.MouseButton1Click:connect(function(Plr)
    sg:Destroy()
    local agesg = Instance.new("ScreenGui",Plr.PlayerGui)
    agesg.name = Check age
    local agefr = instance.new("Frame",sg)
    agefr.Size = UDim2.new(0,150,0,150)
    agefr.Position = UDim2.new(0,0,0.5,-15)
    agefr.Style = "RobloxRound"
    local agetb =Instance.new("TextButton",agefr)
    agetb.Size = UDim.new(1,0,1,0)
    agetb.Style = "RobloxButtonDefault"
    tb.TextColor3 = Color3.new(1,1,1)
    for i = 10, 0, -1 do
    tb.Text = "Are u 13 or Under?(if yes clickhere)(i)"
    wait()
    end
    if tb.MouseButton1Click:connect(function(Plr)
    -- put ur code here for13-
    else
    -- put ur code here for 13+
    end
end)
end)
end)

Hope THis Helps:D.There maybe some minor mistakes u can solve them urr self.