How long does the effect of Botox last?

Now that I'm in my 40s, I feel like my face looks sunken overall, so taking photos isn't as enjoyable as it used to be. My skin elasticity isn't what it used to be, and I'm particularly concerned about my nasolabial folds and volume, so I'm naturally looking into cosmetic procedures. After searching for information, I found that Botox reviews were very diverse, but what I was most curious about was the duration of the effects.

Given the significant cost, I think it is important to know how long the results last after a single treatment. I have heard that it varies from person to person, but I am curious to know how long it took for those who have actually received Botox to notice changes. I would also like to know if the effects remained natural over time or if they wore off faster than expected.

I am also curious if the duration varies depending on the area treated. If there were differences based on the treatment site, such as the forehead, nasolabial folds, or jawline, I would like to hear your experiences. As someone considering Botox, while a consultation with the clinic is important, I believe reviews from those who have actually received the treatment would be the most helpful. Now that I am in my 40s, I prefer natural, long-lasting results over drastic changes, so I would appreciate it if you could share your honest stories.