I'm fine with upping it to 21 across the board with the exception of driving age. When I had to drive into work most days I was more concerned with their parents and how they were texting and driving.Red flag laws are unconstitutional, period.
Change the age to buy a gun? Ok, but let's make sure that age aligns with legal age to enter military and vote.
Probably need to raise the driving age also, as teenage drivers do seem to create quite a bit of death, and if we're establishing an "age of responsibility" then let's make sure it covers everything.