Is it more effective to apply the anti-aging serum in the evening?

I've never used an anti-aging serum, so I'm wondering if it's really necessary.
I am concerned about wrinkles and loss of elasticity, so I want to know if anti-aging serums are actually effective.
There are so many types of serums, so I'm also wondering how to check the ingredients when choosing an anti-aging serum.
I'm also curious if there is an anti-aging serum where I can feel a difference immediately after applying it.
I'm confused about how to use the anti-aging serum—whether I should only apply it at night or if I can use it during the day as well.
I also want to know if I absolutely have to apply a moisturizing cream after applying the anti-aging serum.
I'm also curious about how long it takes to see results and the longevity of the anti-aging serum.
I'm also wondering if using the serum and cream together improves the anti-aging effect.
I want to check if there is an anti-aging serum that even sensitive skin can use.
I doubt that high-priced products are necessarily good for anti-aging.