Which comes first: anti-aging products or lifestyle habits?

Lately, whenever I look in the mirror, my skin feels saggier than before, so I'm wondering if it's really time for anti-aging.
I want to know if I should use anti-aging products or if changing my lifestyle habits first is more effective.
I'm starting to notice wrinkles, and I'm wondering if anti-aging treatments can help prevent them to some extent.
My skin tends to be sensitive, so I also want to check if there is a way to do anti-aging without irritation.
I've been looking up information on anti-aging lately, but there are so many options that I'm having trouble deciding.
I'm wondering if people with skin concerns like me can definitely see results if they do anti-aging treatments consistently.
I also want to find out if there is a simple anti-aging routine I can do at home.
I've heard that the anti-aging effects vary from product to product, so I'm also curious how to distinguish them.
I want to know if consistent use is required to see results, or if I can see anti-aging effects in a short period of time.
I'm wondering if I should start little by little or if it would be better to observe my skin condition further before beginning.