Right. So on the current tour, apart from Djokodal, nobody currently over the age of 28 played at a high level in their 20s. That's what your saying?
People aged 30+ (outside of Djokodal) are not great enough to be in top 5 or top 10 anymore when younger men are peaking in their early-mid 20s but they were in top 20 for as long as they could, infact longer than previous eras of athletes.
In simple words - Previous era ATGs were NOT kicked out by younger ATGs or even younger greats, they were kicked out by lack of Great Age Shift as they were unable to even be in the top 20 after a certain age.
Last age at which a player was seen in top 20
Connors - 37 years 5 months (Outlier like Novak)
Agassi - 36 years 2 months (Outlier like Fed)
Wawrinka - 36
Monfils - 35
Ferrer - 34 years 6 months
Batista Agut - 34 years 6 months
Cilic - 34 years 3 months
Lendl - 34 years (This guy was a freak himself and even his body broke down - outlier but even he went down to health issues)
Fognini - 33 years 10 months
Anderson - 33 years 4 months
Tsonga - 32 years 9 months
Berdych - 32 years 9 months
Michael Youzhny - 32 years
Busta - 31 years 8 months
Sampras - 31 years 6 months (this is a guy who had 12 years between his 1st and last slam and was second to agassi in longevity in his own era)
Edberg - 31 years 3 months (this guy has 8 years between his first and last grand slam final, so his level should not dip lower than modern players, right ? but it did)
Gasquet, Delp, Nishi, Raonic etc etc - 30 years
Becker - out of top 20 before he turned 30 (This is a guy who has a 10.5 years gap between his 1st and last slam and was an athletic + longevity freak in his own era)
Grigor - 31 years 3 months
Sampras, Becker and Edberg were out of Top 20 before 32 because they were all pre age shift athletes, their exodus from top 20 not because of 20 ATGs kicking them, their bodies declined, thats it, otherwise hewitt, safin, roger would not have beaten Pete until 2005. Maybe Roger would have come close to beating Pete in 04 but certainly not Roddick, Hewitt and the other fellows. It would have been a Nadal beating Med situation when Pete is beating Roddick-Hewitt