Is it flirting if a guy says you look way younger than ur age?

my cute coworker and i were chatting I'm new at this job and he asked if i grew up in the area/live there and then he started asking if I knew certain people cus we attended the same high school and I said no and then I asked what year he graduated and then I told him when I did and we realized I'm 6 years older and he was like there's no way you're 28, you look 23 at the oldest was this flirting like implying I look good or just observation

Is it flirting if a guy says you look way younger than ur age?
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