I know you are the village idiot, but reading is fundamental. The original post said YOUNG talent. 27-28 is not young. It might bot be old, but it's not young. Defensive players trail off considerably as they near 30 - especially ones like McPhee who have injury histories. 32 is very old for a LB. A quick look at stats will show you how badly defensive players (hell, most players) drop off as they age. Especially after 30. And Porter, at 31, has 2-3 more years left?
You may want to look at the ages of starting DBs in the NFL. There are very few starting DBs in the league over the age of 30. Of those who are, most are bad and/or at the tail ends of their careers and are a shadow of their former selves (Newman, Gay, Pacman, Leon Hall, McKelvin) or injured and get cut (Lewis, Browner, etc). Brent Grimes might be the only exception.
There's a reason that most NFL rosters don't feature defensive players over the age of 30. They are slower, often hurt and just not as good at football.
Tracy Porter will be 31 years old. Most 31 year old CBs are out of football. As should he be.
Seriously, make an attempt to think something through before you post. You embarrass yourself regularly.