Help me!!!?

without noticing it till my mother tells me... i have ended up liking 'old' music such as Johnny Winter, Bon Jovi, Duran Duran, a few Bonnie Tyler and Tiffany songs, Stone Sour, Three Days Grace, Eagle Eye Cherry, Foreigner, Pat Benatar and loads more... Im 14 for gods sake according to ma mum half of them are before I was even born, some before SHE was born... is this normal?