If you have access to a printer, it may be worth printing a photo of your date to take with you on your date. This will help you in several ways...
It is unlikely that the person who greets you on your date won't be the person on the photo. If you have the photo with you; you can make up your own mind.
You can also see if the person was honest about their age if they are older than when the photo was taken.
If you can print a photo of the person you are meating, it may be a good idea to print 2 copies, giving one to a friend who knows where you are going on your date and what time you are expected back.