Sure, many countries change parts of their constitution from time to time, usually through a parliament. The question was however: "So every generation has to vote a new constitution?" because earlier someone was questioning the Spanish constitution since "no one under 57 has voted on it".
You would also want to note that many constitutions in Europe aren’t that old many were rewritten following WW2 and those which weren’t are often modified and ratified.
There is no legal difference between adding or removing parts of a constitution and voting on a new one.
You still need to approve a new constitution and ratify it.
If you start from scratch it means that you either didn’t have a codified constitution or it was really shitty but those are pretty unique cases.
I really don’t see a problem of revising a constitution once every 25-50 years.
Thomas Jefferson said something along those lines. I think every generation might be a little extreme. Every other generation, certainly.