Board Thread:General Discussion/@comment-27324545-20160105135410/@comment-39394247-20191003175308

I'd say Frisk is 13.

Cyan human: 4-8, gender doesn't matter

Orange human: 7-12, likely male

Blue human: 11-17, unknown gender

Magenta human: 14-20, unknown gender

Green human: 18+ (could even be somewhat elderly), unknown gender

Yellow human: 22-24, likely female