Curate, connect, and discover
Headcanon that Batman is the youngest in the (main)Justice League roster.
For proper execution, he must be at least 2-3 years younger than the supposed youngest
This headcanon lives co-dependently with the self-accepted that Bruce also has the most grey hairs in his group
I have also had the scenario of Hal freaking out and Barry having an existential crisis over the fact that the Batman is younger than them play out far too many times in my head
Do with this what you will