When your age don't exist
Much of the youth don’t seem to care about getting old, or about their age, until they become full adults. ADHD patients also frequently report mental age that is “different” from their real age, hence age that “don’t exist”
Same things is true for young kids, they seem to want to grow up so fast, instead of being youthful at their age.
The sentence also refers to a demographics (not sure where that comes from but Jay-Z in “Murder To Excellence” and Pusha-T in “So Appalled” also refer to it) claiming that by 21 a African American male is fated to die.
As Kendrick is 23 in the song, or by the time of the recording, it means he past that fated mark and thus as an age that does not exist.
This line also refers to being dead, when our age will not exist. It is ironic, as Kendrick Lamar is saying that we will be able to drink as much as we want and do as many drugs as we want when we are dead (when our age doesn’t exist).
It’s all just age concerns!
Since ‘H’ represents ‘Hyperactivity’ in that disorder, one would indeed have a higher tolerance without it.
“Age” could also refer to Kendrick’s generation: born in the 80s and referred to by his lady friend as “crack babies.” We’re a generation raised on the internet and other rapidly-changing, addictive technologies who missed out on learning how to connect with our peers and build our communities. Now the generation displays qualities of being a lost generation — an age that doesn’t exist, depicted here by Kendrick as searching for happiness/relief from pain in alcohol and drugs.
The theme of misdirected attempts at emotional fulfillment comes up repeatedly in Kendrick’s music.
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