You are a good candidate for either Thermage or Refirme at your age.
They both use Radiofrequency energy to heat the deep dermis while sparing the surface of the skin. Thermage monopolar, Refirme bipolar.
Thermage treatment takes 90-120 minutes and the pain factor is moderate.The improvement is gradual(4-6 monthsor longer), although some patients see more rapid improvement. Some patients need a second treatment after 6 months.
Refirme treatments take about 30 minutes but you will need 4-6 repeat treatments, 2-4 weeks apart. The pain factor here is also moderate.
Please make sure that you choose a qualified, Board Certified Dermatologist or Plastic Surgeon to have either of these treatments done.