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Skin age estimates how old the skin looks or functions relative to chronological age. UV exposure is the biggest external factor, causing 80% of visible facial ageing. Smoking, sleep, and diet are also major contributors.

Trinn-for-trinn guide

1. 1UV exposure: +years (biggest modifiable factor)
2. 2Smoking: +2-5 years · No moisturiser: +1-2 years

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