Is he interested in me???Im soo confused..?

theres this guy i really like but hes the brother of the guy i lost my virginty to.Hes super hot.lol well we talked and flirted last week and then sunday we talked and made plans for today if he dosent have anything goin on.He said i hope we can and then all day yesterday didnt txt me at all except at 11 at night askin how old i am (he already knows the answer)i dont know why he asked that.Then today he hasnt txted me at all to hangout.Wtf.Is he interested in me or what???Why would he ask that if he already knows the answer???thanks!