Please let me know who I recommend fillers to! I'm wondering in what cases it is appropriate to start.

I'm thinking about getting fillers, but I'm not sure at what stage I should start.

I'm wondering if there is a specific target audience for fillers.

I'm wondering if it's better to get it done when my face is significantly sunken, or if it's possible to just fill in the slightly lacking areas.

I'm also hesitant because if I start fillers too early, I feel like I'll have to keep maintaining them.

I've heard that timing is important, so I'd like to know what the appropriate standard is. I'm hesitant because I'm not sure if I qualify for fillers, so I'd appreciate it if those of you with experience could share what condition you were in when you started.