silver miner
A girl who's into older men. If the girl's under 18, she's a "silver minor."
"I can't believe Julie is flirting with that 65-year-old professor -- she's such a silver miner."
silver miner
A woman who goes after someone who has more than average money. She shoots a little lower than gold diggers, but she's still in it for the money.
Gwen is such a silver miner! She didn't marry a millionaire in Paul, but he's got money since his family owns that local business.