The short answer
A properly used zinc oxide sunscreen can help limit UV exposure as part of an aging-well routine. That is a protection benefit, not a treatment that removes established wrinkles.
Protection relies on the finished sunscreen's tested broad-spectrum performance rather than the specific percentage of zinc oxide listed on an ingredient list.
AAD recommends a broad-spectrum, water-resistant SPF 30 or higher product alongside shade and protective clothing. No sunscreen blocks all UV exposure.