How often do you empty your vacuum???

I'm in the middle of one of my cleaning binges, and have had this vacuum in this house for nearly a year...(had it alot longer than that - its like 20 years old in itsself), and I just had a thought... I vacuum about once a week...and i dont recall actually seeing where all my dirt has got too....and then i had a worse thought! it its like 20 years old...it would take bags...and i wouldn't have a clue what type!! i'm terrible... and now i'm dreading opening it...


in saying that...it still sucks like nothing else...so cant be too full...right?


*here i go*