Hell, the only 'old person car' I wouldn't leap at would be an olds.
Caddy, Lincoln, Crown Vic, Grand Marquis . . . I'd take any of those in a heartbeat. And a nice used beamer, of course.
What I really, really want is a giant Caddy convertable, real shiny black paint job, and fins. I would love that car forever . . . bench seats front and back are a must, tho.