Turbo can last forever.
Your mechanic's list will include compression test, running gear, suspension, oil sludge & burning, exhaust, coolant (for oil contaminant), leaks/seepage, irregular wear and tear and rail damage, hoses/clips, rust.
Your list will include running electrics, air cond, wear on steering wheel/bolster on driver's side/carpet/key entry to barrel/pedals, worn paint of panel bolts, doors dropping on opening, paintwork, rear wheel well, rust.
We want to know if it's had a hard life so that you don't have to cop the back end of it!