How much is car insurance for older muscle cars?

I heard that car insurance is pretty expensive for older muscle cars, and I’d like to know around how much a month car insurance would be for a 1968 ford mustang?

Does motorcycle insurance cheaper the older the bike compared to a new one?

I 24 yrs old and i am looking to buy my first bike. Insurance is very pricey for a young buck. If i was to buy an older model motorcycle would insurance be cheaper.