Is it healthy to only be attracted to guys slightly older than me?

Hi guys,I’m 20 and bisexual.I can’t really find guys younger than 23-24 attractive, with the age range I find most attractive being around 25-35. There can be some exceptions either side of this range however.Is this normal? I would like to be attracted to guys my own age as it would make dating easier but it’s just so rare for me to find somebody I am attracted to around my age.Thanks :)