I have had mine done 10yrs, had 300’s over n am going for another as they have dropped quite alot plus I had a child during that time. Am going for 700’s this time round n due to size the cost is around £5k hun, they do generally cost more for a re-aug.
They do last a lifetime but it really depends if u r still happy with them, I know people who have a re-aug after 2yrs as they want to go bigger n I know others who r still happy with theirs after 18yrs.
Xx