The Brembos that come on Type S/Manual models wear fast. I've changed them at 20,000 miles. They are expensive also.

Non-Type S/Manual models I have seen go 80,000 miles. The biggest factor on brake wear is how the vehicle is driven.

At 50,000 miles I would have them inspected. Depending on where you go, make sure you get an accurate measurement of both pads (inboard and outboard). 2mm is the service limit and about that time the indicators start making noise, but not always. Most indepent shops are going to sell you brake pads at 4mm. That's another 10,000 miles at least you could have driven on them.

Never replace just the brake pads, resurface or replace the rotors. The uneven surfaces of the rotor will cause your new pads to wear incorrectly and possibly cause brake noise. Most aftermarket pads will cause a squeel.