My 2003 Subaru Outback is at 227,000 miles how long it will drive for?

If the rest of the car is in top shape you might get your money's worth from those repairs but I doubt it is worth spending the money.

2000-2004 Leg/OB unibodies rot at the rear quarters, both up the wheel eyeballs and, more critically, down where they meet the rockers, reducing structural integrity...especially when hitting potholes at speed. I'd have a thorough underbody inspection performed to ensure you're not just bolting new parts onto crumbling soft steel. By the way, a tranny mount and a new (aftermarket) CV should cost in the $400 range...not $1k. If you haven't drained and refilled the 4EAT in a few years I'd certainly perform that cheapie just to keep it happy. Use 10w40 to quench minor seepage, but if your #4 cylinder corner is wet with coolant know that the HGs are compromised, so you're on the death curve with this dinosaur regardless of body corrosion, eh? Best, Ern TSG/B