Sandisk Extreme USB 3.0 lifespan

I have the exact 16gb extreme version of sandisk usb 3.0 flash drive and it has been going great for me for 3 years.

my issue is that recently i formatted it to another cluster size (data allocation unit size as windows puts it) bu forgot the out-of-the-box factory default cluster size. windows puts it on 8 kb default.

Was it 16 kB when it came out of the box? Can you guys please tell me if you have the exact thumbstick?

Thank you.