pretty much what everyone on here has said rings true - do you enjoy the vehicle? Does it bring a smile to your face when you drive it? If so - don't worry about what others think and enjoy the drive (not many cars out there now days that check a lot of the boxes for enthusiasts like the Z does).
I'm 44 and this is my second 370z - like I tell most people - it's not a stoplight monster like a Mustang or Camaro but it is a fun responsive balanced car that looks better than most sports cars (even after 10yrs). Have fun and enjoy it