My sister got Botox. She is in her 40s and had lines on her forehead. The Botox made her lines almost completely disappear in that area. You can barely even see where the lines were. It's amazing how smooth her forehead is now. Most of my friends are older than me and they've had Juvederm, Sculptra, Laser treatment under the eye, neck lift, boob jobs, IPL, you name it.
If you want to freshen up your appearance a bit, do the Botox but also get some Juvederm Ultra or Sculptra to puff out the lines around your mouth and also in the tear trough area and out onto the cheekbones (I'm just assuming you need it - you may not). Sculptra is good because it lasts about 1.5 years but it actually takes about 3 months to see any results as it helps you produce your own collagen.
Best to meet with a reputable doctor who does these things and get his or her recommendations. Also the following forum is good because it gives the % rates of people who have been satisifed with various injectibles - example 78% of people who answered said that they were happy with Botox - and explained why.
http://www.realself.com/