A decent porcelain crown is said to last 10 - 15 years, but it will be past it's best in terms of aesthetics at about 10 max if not sooner. Gold crowns can last much longer providing the gums and teeth are kept healthy.
Amalgam fillings can and do often last a lifetime. It's also unhealthy to remove them if not absolutely necessary unless you have a special shield to protect you from breathing in the mercury. If a dentist wanted to change any of my fillings I would go for a second opinion.
A dentist once wanted to remove my wisdom teeth despite me having absolutely no problems with them. I said thanks but no thanks and still have them 16 years later nicely sealed and sans decay. The secret to healthy teeth is to avoid unecessary dental work and maintain a high standard of dental hygeine and a healthy diet. If you smoke - stop - it rots your gums. Don't drink fizzy or sugary drinks or if you do then use a straw. Invest in a sonicare - they're great.
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