I also suffer from ocular migraines.  They are often associated with changes in the weather and/or barometric pressure.  Usually if I take a couple of Excedrin tablets or a Fiorinol capsule at onset, I can prevent it developing into a full migraine.

I don't want to pick a specific age.  I'm 70 now and in good health, so as long as that remains true, and I'm able to live a meaningful life, I want to keep going.