Is it strange for an 18 year old to love beyblade?

I'm going to be 50 in 2 month's time, I've been into Beyblade, on and off, for the last 25! You're never too old to let it rip!
I don't think it's strange. I've noticed that a lot of people are actually starting to be more accepting of stuff like beyblade because they want to relive their childhood. Keep doing what you love! Eventually, this stuff may be very expensive and you'll have a lot of money.