Not without impacting other political aspects. Remember we only lowered the voting age to 18 some 50 years ago to justify the ability to send more kids to a war we started. And that's only the tip of the iceberg.
But can’t be allowed to have a beer or a whisky, and isn’t able to freely consent to sleep with someone five or ten years older.
I wonder what the official legal justification for this dichotomy is, if there is any.
Edit: after looking it up, there doesn’t seem to be one.