How many Ulthera sessions are usually recommended?

As I get older, I am concerned about my jawline and sagging cheeks, so I am looking into Ultherapy. I am curious about the recommended number of sessions.

I'm confused because some say the effects of Ulthera last a long time even after just one session, while others say you need to get regular treatments.

In particular, I am curious if there are differences depending on age group regarding the recommended number of Ulthera treatments.

My skin is on the thinner side, so I'm a little worried that getting it done too often might cause hollowing in my cheeks.

When I looked up the recommended frequency for Ulthera, I saw many places suggesting about once a year. For those of you who have actually received it, how did you manage your aftercare?

I am also curious whether the effects appear immediately or if the lifting sensation develops over time.

Since it is an unnecessarily expensive procedure, I want to make a careful decision, so please share your experiences regarding the recommended number of Ultherapy sessions and satisfaction levels.