Why didn’t he ask for my age?

I finally had a conversation with the guy I like and I asked him how old he was he just gave a little laugh and said “why?”Like why did he ask me that? I was like oh I’m just curious then he said his age and continued to have a conversation with me for at least 5 mins we talked about random stuff like what schools we went to where we live and when I started working there etc but the time I thought he was going to ask for my age but not once did he ask that and why did hr laugh and say “why” when I asked him his age? Is that a sign of disinterest?

Why didn’t he ask for my age?
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