If you have signed in to POF lately using your POF login you might have noticed they changes the color of their website a bit. Instead of the aqua colored blue they once had it is now a dark blue. The overall layout of the dating site still remains the same.
Another thing that has changed is upgraded members thumbnails now show up a tiny bit larger in your email. So when an upgraded member emails you, their email will stand out a little. Not sure if this is another “perk” they are adding to try to get people to pay for a membership upgrade or not, but most likely is. If someone is interested in talking to you, a slightly larger thumbnail or a standard thumbnail will probably not really matter, most people read messages in their POF inbox.
If a person tends to date older or younger then I guess they are a bit out of luck using Plenty Of Fish. In this instance though it appears as if a majority of users wish to date within a few years of their age group. Some members have bypassed this POF inbox limitation by using a false age. It works but it is not recommended, it is a good way to get your PlentyOfFish account deleted if someone reports you. Most dating sites do not have this limitation. Based on analysis one can assume that Plenty Of Fish knew what they were doing when they set the email age restrictions.