How you handle your artwork will affect how long it lasts.
Handle with extreme care to avoid kinks.
Ideally, wear gloves to keep skin oil and dirt off the paper.
Watercolours should always be framed behind glass or placed in mattes in a protective box or album. When framing an artwork, be sure to use a reputable framer who uses archival products that will assist in keeping your print looking good for generations to come.
Museum glass costs more but will increase the longevity of your artwork.
Use good quality conservation or museum mattes when framing. Never frame an artwork directly behind glass - always use a matte to separate the paper from the glass, allowing it to breath.
Hang your artwork away from direct sunlight or lights that emit a lot of UV.
All a framed artwork should ever need is dusting for the frame and cleaning the glass - your framer will advise you how to clean museum glass. Regular glass can be cleaned with any normal glass cleaner.