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For the Rogue, the description of the Ability Score Improvement (PHB, p.96) says:
When you reach 4th level, and again at 8th, 10th, 12th, 16th, and 19th level, you can increase one ability score of your choice by 2...
and the Feats description says (PHB, p165):
At certain level, your class gives you Ability ScoreImprovement feature. Using the optional feats rule, you can forgo taking that feature to take a feat of your choice instead.
Using logic you have the oportunity to receive a feat each 4 levels. So if I up my character to level 24, 28, 32... I can still take new feats?