Is choosing the right timing more important than the effectiveness of Ultherapy?

Lately, I feel like my facial elasticity isn't what it used to be, so I am looking into lifting procedures.
While comparing various types, I became interested in Ultherapy because it has been a well-known procedure for a long time, but I am wondering when would be the best time to get it.

The sagging isn't severe yet, but I'm not sure if it's better to start managing it now or if it's right to wait until there are noticeable changes.
Some people around me say that it is difficult to manage if you start too late, while others say you should decide based on your skin condition.

For those of you who have personally received Ulthera, when did you start, and do you still feel that it was a good choice?