I'm a big believer of preventive instead of corrective. But your skin, just like any other parts/organs of your body, function with memory- ever heard of skincare products losing efficacy? If your skin gets used to / becomes dependent on anti-aging and other heavier, more intense treatments at a young age, its natural regeneration ability will slow which might in turn make you age even quicker when you really do start to age (>25 years old).
While genetics play a part, I agree with most of you here: a healthy lifestyle with a nutritious diet, plenty of exercise, sunscreen and water is the best solution to fight aging at all ages. Skincare is just topical- you cannot erase wrinkles but you can look healthier by living healthier.