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When you’re building or buying a home in your 30s, it’s hard to know what you’ll need in your 70s.

Elements you include in a house now, though, can help it remain a comfortable place to live for years to come.

Although it’s less expensive to incorporate them when a house is built, some can be added to an existing home.

Here are some features to consider adding to help a house age gracefully. They were suggested by Rose Juriga, Mike Simko, the American Association of Retired Persons and the Center for Universal Design:

General

– Plenty of strategically placed lighting, both natural and artificial.

– Lever handles on faucets, doors.

– Doorways with a clear opening of at least 32 inches.

– Doors that require no more than 5 pounds of force to open.

– Rocker-type light switches positioned 44 to 48 inches above the floor.

– Electrical outlets 18 inches above the floor.

– Easy-to-operate windows, positioned low for a good view.

– Continuous floor surfaces.

– Thresholds no higher than one-half inch.

– Well-lighted closets with adjustable-height rods and shelves.

– Accessible route throughout the house, at least 42 inches wide.

– High-contrast, glare-free floor surfaces and trim.

– 5-by-5-foot maneuvering space in all rooms and at the house entrance.

– Extra electrical circuits to handle the load of medical equipment (or, for that matter, the kids’ high-powered computers).

Entrance

– Accessible route from vehicle drop-off or parking.

– Covered entry.

– Full-length sidelight to see out.

– Lighting focused at keyhole.

– Textured surface on sidewalk.

– First-floor entrance without steps (graded if necessary) and as low a threshold as possible.

– Non-slip floor in the foyer.

– Highly visible address.

Stairs

– Minimum height allowed by code for risers.

– Railings on both sides.

– No open risers.

– Indirect lighting that shines uniformly on the steps but doesn’t create glare.

Master bedroom

– First-floor location.

– Access to exterior in case of emergency.

– Intercom/music system convenient to bed.

Kitchen

– Multilevel work areas (25 to 45 inches high) to accommodate children, seated people and standing people.

– Open spaces beneath seated work areas.

– Task lighting.

– Cabinets lowered three inches from conventional height.

– Knobs or U-shaped cabinet pulls; no latching devices.

– Shelving that pulls out or down.

– Contrasting border on counter top to aid visual orientation.

– Stretches of continuous counter for sliding heavy objects.

– Front-mounted controls on appliances.

Bathrooms

– Large sliding pocket door.

– Slip-resistant flooring.

– Tub with easy access, a non-skid surface and safety rails, or at least reinforced walls for adding rails later.

– Toilet 18 inches from side wall, with 18-inch-high seat and safety rails or reinforced walls.

– 32-inch minimum counter height and knee space under sink.

– Mirror that extends all the way down to the back splash.

– Shower with low threshold, fold-down seat with lightweight hand-held shower head and other accessories within easy reach.

– Mixer valve with pressure balancing and hot water limiter.