As baby boomers have aged, they have accumulated more assets leading to more discretionary spending. Since retiring two years ago, Joan Harris has upped her travel game.Once or twice a year, she visits her two adult children in different states. She’s planning multiple other trips, including to a science fiction convention in Scotland and a Disney cruise soon after that, along with a trip next year to neolithic sites in Great Britain.“I really have more money to spend now than when I was working,” said Harris, 64, an engineer who worked 29 years for the federal government and lives in Albuquerque, New Mexico.Back then, she and her now-ex-husband were paying for their children’s college educations and piling money into savings accounts.