I bought them 2, maybe 3 years ago.
OK, then they're most likely the new sharper Extras. Closer to the Derby Premiums.
Other possibilities:
Has your technique changed? Concentrate on pressure and angle.
Hair getting tougher? Maybe a slightly sharper blade would cut better, possibly even saving you a pass. German Wilkies, 7 O'Clock SS (St. Petersburg), Personna Lab Blues (USA)
Have you changed soaps? I find a correlation between the quality of my lather and the quality of my shave.