Quote from @Greg Scott: I started at age 46.

But are these houses still appreciating despite their age?

Similar age, quality and purchase price.

Quote from @Calvin Thomas: You claim to be successful, but at 80 years of age you still spend your days mocking a guy 1/3 your age even though he's 10x more financially successful than you and has helped millions more.There's a difference between being funny and being an a$$hole. 

My client purchased the property due to the age, condition, low maintenance/durable design, and income relative to the acquisition cost and overall price.

You can always use cash from the sale of your home to invest in a better rental property.You may want to sell your home if…It is a sellers’ marketYou don’t want to be a landlordThe home needs lots of work before it will be rental readyYou can’t charge a high enough rent relative to the home’s valueThe neighborhood is not enticing for rentersYou don’t have adequate cash on hand to cover vacancies and maintenanceThe house is not a good rentalYou have lots of equityYou anticipate excessive maintenance issues due to age or condition of the home.All the best!

Also some DSCR programs will not source funds but will instead do an IBV (instant banking verification).

Insurance is going to depend on many factors, including the age of your home and purchase price. 

After this meaningful experience, we improved our screening process, requiring verification and identifications, the signing of a rental agreement, and security deposits.We also enhanced our check-in process securing all our properties entry with more sophisticated keypads.In regard to technology, we acquired a real-time verification payment gateway.

@Jorge Siverio The main things taken into account are the number of beds/baths, age of the home, lot type, and square footage, in addition to any additional smaller features the home may present.