Comment by FroshKiller

Yes, you've missed the boat. You have the neuroplasticity of a bucket of dried joint compound. There is no point in studying anything at all, let alone mathematics. You are totally incapable of acquiring and synthesizing new information. To even try would be an affront to God. Whatever subjects you have learned by your advanced age are the only ones you can hope to advance in, contribute to, and profit from forevermore.