Vaseline is derived from petroleum and to me that would be a toxin, something I would not put on my skin. I would rather use a natural ointment like coconut oil, shea butter, or combine aloe vera and jojoba oil.
Celebrities have had cosmetic surgery, that is why they look so good at their age. Any others, could have good genes. From the original post, 40 is not that old, you do not have that many wrinkles, sagging at that age, and could still pass for 30.