Is it okay to start Thermage before my skin sags significantly?

Lately, I often hear people around me saying that it is better to take care of your skin in advance when it starts to lose elasticity, rather than waiting until it has sagged a lot.

I also feel like my skin has lost a bit of its firmness compared to my old photos, but it isn't severely sagging yet.

So I'm wondering if it's too early to get Thermage right now 😮 or if it's something I can consider for the sake of maintaining my current skin condition.

I also want to know if it is better to judge based on the actual condition of the skin rather than making a decision based solely on age.