Much of what will keep a mattress going for longer boils down to regular care and maintenance. Washing and exchanging bedding on a regular schedule (we recommend every 1-2 weeks for most sheets), combined with an occasional cleaning of the mattress cover every few months will go a long way. Rotating the mattress a few times a year will help to spread out natural wear and tear across the mattress.
When it comes to the day-to-day, treat your mattress gently and with care. If possible, try to use the bed only for sleeping and avoid exposing it to strenuous activity such as jumping on the bed.