Is it a good idea for a 50 year old to ask a 25 year old out on a date?

Stranger Things have happened and if two people are attracted to each other and both are not minors then ask away. The percentage of a person being 10 or more years older than the other usually doesn't work out unless the 50 year old is extremely active and into having fun. There will be communication gaps and places she may want to go (party on so to speak) that you may find exciting at first, but get bored quickly with it. Still, if you feel there is a chance then go for it.