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It is always good to apply sunblock, regardless of past exposure. In your case, it is probably recommended because of the damage. (Remember, even a suntan is a sign of skin damage.)
One thing to keep in mind in regards to skin cancer and UV damage: Skin cells have a memory, which means UV damage is cumulative. So, even if you use sunscreen from now on, the damage you've acquired in the past is residual. Basically: Wear sunscreen from now on--use SPF45.
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Knowing that death is certain and that the time of death is uncertain, what's the most important thing?
—Bhikkhuni Pema Chödrön
Humankind cannot bear very much reality.
—From "Burnt Norton," Four Quartets (1936), T. S. Eliot
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