Does a thin face with no cheek fat look really old if it gets Ultherapy done incorrectly?

I have a thin build with no fat on my face overall, but recently I have noticed that the skin under my chin and around my marionette lines is sagging slightly.
I get stressed every time I look in the mirror because my skin elasticity has decreased, and people around me have warned that if I get Ultherapy on a thin face done incorrectly, all the fat will disappear, causing me to look much older.
I heard that Ulthera is effective in burning or shrinking fat, so should people like me with little cheek fat avoid this procedure altogether?
Alternatively, I am wondering if there is a way to maintain elasticity without cheek hollowing by significantly reducing the number of shots or targeting only specific areas (jawline, double chin, etc.) to avoid the procedure.
Are there any specific checkpoints I must verify or professional questioning techniques I should use during a consultation with a doctor to avoid cheek hollowing?
I am scared because I saw a rumor that if it is applied incorrectly to an area with a thin layer of fat, it could cause side effects such as nerve damage or unevenness.
I would like to know if someone with a slim build should consider other lifting procedures before Ulthera, or if Ulthera alone is sufficient for prevention if the treatment is designed well.
I would appreciate it if you could share detailed cases of those who received Ultherapy while having thin cheeks and were satisfied or regretted it.