Use daily broad-spectrum sunscreen SPF 30 or higher
Apply a retinoid at night
Use a moisturizer with hyaluronic acid or ceramides
Stay hydrated
Get enough sleep
Reduce stress
Avoid smoking
Limit alcohol
Do not overexpose your face to the sun
Use gentle skincare products
Exfoliate mildly and not too often
Massage the forehead gently
Practice relaxing the forehead muscles
Consider Botox injections
Consider dermal fillers
Consider microneedling
Consider laser resurfacing
Consider chemical peels
Consult a dermatologist