Question

for a medal

Some video games carry an "M" rating. These games are for players ages 17 and up (a ≥ 17). Some video games carry an "AO" rating. These games are for players 18 and up (a ≥ 18). For all real numbers a, what is the intersection of a ≥ 17 and a ≥ 18?
a ≥ 17 ∩ a ≥ 18