Re: Downey's last?
IF he wanted he could do these up until his mid 50's. I watched IM2 the other day and I totally forgot how much CGI is in the action sequences in these films. Sure, he would still need to be in really good shape to do these later in life, but its not like he's doing an action character that virtually uses no CGI.
"If you figure a way to live without serving a master, any master, then let the rest of us know, will you? For you'd be the first person in the history of the world."