My great grandmother still lived in her own home and took care of herself quite well into her hundred's and wasn't even in possession of a healing factor or whatever so I am with firetears somewhat since I would think Steve might pull of 135/40, Tony not so much unless he like invents stuff that keeps him going or extremis is just that good... actually.

Also, I would say to retirement, they would die in a blaze of glory something would go on and they would be brought back to life young and pretty but this time wholly aware of one another's love and show the youngin's why they are legends.