when is it time to ditch my 2007 Subaru? Mechanic said head gasket broken.

That's still low miles for an '07 Subaru. I would do it. I have 115,000 on my '04 and just paid $2445 for both head gaskets, intake and exhaust manifold gaskets, valve cover gaskets, all belts, pulleys, seals, water pump etc. I think it'll now easily get to 200,000 and I hope many more. Worth it to me to not put out big bucks for a new one. I have had mine since 5,000. Also, I have a great non-dealer mechanic who uses all Subi parts.

how many miles/get 2nd opin.