Invisilign for Crooked Teeth on a 40-year-old?

The only way to KNOW would be to seek a local dentist or orthodontist and see what they suggest.  Depending on your expectations, you may be a "slam dunk"!

Based on the photo you have posted it appears that you would be a great candidate for Invisalign treatment.  Invisalign was developed specifically for adults who didn't want to wear traditional braces.  I have seen Invisalign treatment do amazing things in treating crowded dentitions.  Seek the opinion of a qualified Invisalign dentist and enjoy smiling once and for all!

Actually, most of our invisalign patients are women in their 40's and 50's.  They have always wanted straight teeth, but did not want the brackets and wires or their priorities were their children and husbands.  Now in their 40's, many have time and money for themselves and there is invisalign which makes it much more amenable for them, not having to deal with a "metal mouth". 

Currently, we have three women teachers and a man in his 40s who  is a  minister undergoing inivisalign treatment . They are so pleased to have made the decision to give themselves the smile they have always wanted!  Go for it!