Goosebumps inquiry

I (30f) met a man (early 40s probably) in a semi-professional capacity today and he was REAL friendly. Not creepy or unprofessional, just talkative and unmistakably flirty. Towards the end of our interaction, he leaned in close to show me an example of something on his phone and I noticed his entire arm (closest to me) was covered in goosebumps and it definitely hadn’t been a several minutes before.

I know what it means for me as a woman to have that reaction to someone but what does it mean for a man in his forties?