Skipping skincare entirely. Many men avoid products due to stigma, but a simple routine of cleanser, moisturizer with SPF, and a retinoid at night can dramatically slow aging.
Yes, gentle chemical exfoliation (like AHAs) 1-2 times a week can remove dead skin cells, promote renewal, and help your other products penetrate more effectively, but avoid over-exfoliating.
Stress management. You can use the best topical products available, but if you are chronically stressed, elevated cortisol levels will continually work against your efforts to maintain collagen and a strong skin barrier.
The appropriate percentage of retinol will vary depending on your skin type and tolerance. For sensitive skin, a lower percentage (0.25% or 0.5%) may be more suitable. For those with more resilient skin, a higher percentage (1%) may be tolerated.