Drive Me to Vegas and Mars (1970)

Cowboy, a senior citizen ex-lawyer and gambler, is persuaded by his spunky seventeen year old neighbor, Rachel, to seek retribution for having been cheated in Las Vegas many years ago. So begins a wild adventure that marks a young girl's rite of passage into womanhood and an old man's bittersweet final awakening to life, love and happiness. Along for the ride is Maggie, Cowboy's salty ex-girlfriend, Buddy Boy, Cowboy's best friend, and Harold, an unusually young Vegas motel owner who falls hard for Rachel.