Can a crown last up to 30 years or more? Will I end up losing my tooth if not taken care of my crown? Or can I just replace

Crowns don't come with an expiration date. Many crowns can last a very long time but there are many factors which need to be considered. First, the quality of the crown and the technique used to place it are very important in determining the longevity of a crown. Next there are other risk factors which can also effect how long a crown lasts. Diet, medications and overall health come into play. Do you have gum disease? This could also be a factor. An evaluation of how long dental work has lasted in your mouth previously can be an indicator as to how long your new crown will last.

Yes, a crown can last 30 years depending on many factors including how clean you keep it, your biting habits, the type of material it was made out of, the skill of the dentist and lab,etc. If you do not take care of your crown, you can get decay at the edges of it that then can work its way up underneath. It's important to have regular checkups and xrays to catch this early if it is happening. Otherwise the decay can get deep enough to compromise the tooth underneath the crown severely enough for it to have to be removed. If caught early, more conservative treatment or even replacing the crown can be done without having to lose the tooth.

Ceramic crowns that are bonded into place are extremely technique sensitive and depending on the understanding of bonding will influence its life span.  Porcelain fused to metal crowns will also last a long time but are not indicated in the front teeth since they look opaque and not natural and cause the color of the gum to look purple.  There is not exact time that a crown will last as many factors will influence its life span.