What would be a good first anti-aging treatment?

Lately, my skin feels like it's sagging overall, so I'm considering getting my first anti-aging treatment. There are so many types of anti-aging procedures that I'm wondering what's a good, gentle start! There are just so many options that I don't know where to begin... I'm not sure if a lifting treatment or a skin booster would be better. I'd prefer something that takes a short time and allows me to return to my daily life immediately. I also want the results to be natural rather than too dramatic. Since I know I need ongoing maintenance, I'm looking for something within a budget that isn't too burdensome. If you have any recommendations for an introductory anti-aging treatment, please share your reviews or experiences! What would be the safest bet for beginners?